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History of Cambodia

The history of Cambodia, a country in mainland Southeast Asia, can be traced back to Indian civilization. Detailed records of a political structure on the territory of what is now Cambodia first appear in Chinese annals in reference to Funan, a polity that encompassed the southernmost part of the Indochinese peninsula during the 1st to 6th centuries. Centered at the lower Mekong, Funan is noted as the oldest regional Hindu culture, which suggests prolonged socio-economic interaction with maritime trading partners of the Indosphere in the west. By the 6th century a civilization, called Chenla or Zhenla in Chinese annals, firmly replaced Funan, as it controlled larger, more undulating areas of Indochina and maintained more than a singular centre of power.

The Khmer Empire was established by the early 9th century. Sources refer here to a mythical initiation and consecration ceremony to claim political legitimacy by founder Jayavarman II at Mount Kulen (Mount Mahendra) in 802 CE. A succession of powerful sovereigns, continuing the Hindu devaraja cult tradition, reigned over the classical era of Khmer civilization until the 11th century. A new dynasty of provincial origin introduced Buddhism, which according to some scholars resulted in royal religious discontinuities and general decline. The royal chronology ends in the 14th century. Great achievements in administration, agriculture, architecture, hydrology, logistics, urban planning and the arts are testimony to a creative and progressive civilisation - in its complexity a cornerstone of Southeast Asian cultural legacy.

The decline continued through a transitional period of approximately 100 years followed by the Middle Period of Cambodian history, also called the Post-Angkor Period, beginning in the mid 15th century. Although the Hindu cults had by then been all but replaced, the monument sites at the old capital remained an important spiritual centre. Yet since the mid 15th century the core population steadily moved to the east and – with brief exceptions – settled at the confluence of the Mekong and Tonle Sap rivers at Chaktomuk, Longvek and Oudong.

Maritime trade was the basis for a very prosperous 16th century. But, as a result foreigners – Muslim Malays and Cham, Christian European adventurers and missionaries – increasingly disturbed and influenced government affairs. Ambiguous fortunes, a robust economy on the one hand and a disturbed culture and compromised royalty on the other were constant features of the Longvek era.

By the 15th century, the Khmers' traditional neighbours, the Mon people in the west and the Cham people in the east had gradually been pushed aside or replaced by the resilient Siamese/Thai and Annamese/Vietnamese, respectively. These powers had perceived, understood and increasingly followed the imperative of controlling the lower Mekong basin as the key to control all Indochina. A weak Khmer kingdom only encouraged the strategists in Ayutthaya (later in Bangkok) and in Huế. Attacks on and conquests of Khmer royal residences left sovereigns without a ceremonial and legitimate power base. Interference in succession and marriage policies added to the decay of royal prestige. Oudong was established in 1601 as the last royal residence of the Middle Period.

The 19th-century arrival of then technologically more advanced and ambitious European colonial powers with concrete policies of global control put an end to regional feuds and as Siam/Thailand escaped colonisation as a buffer state, Vietnam was to be the focal point of French colonial ambition. Cambodia, although largely neglected, had been colonized by the Indochinese Union given a perceived entity and was able to carry and reclaim its identity.

After 80 years of colonial hibernation, the brief episode of Japanese occupation during World War II, that coincided with the investiture of king Sihanouk was the opening act for the irreversible process towards re-emancipation and modern Cambodian history. The Kingdom of Cambodia (1953–70), independent since 1953, struggled to remain neutral in a world shaped by polarisation of the nuclear powers USA and Soviet Union. As the Indochinese war escalated, and Cambodia became increasingly involved, the Khmer Republic resulted in 1970. Another result was a civil war which by 1975, ended with the takeover by the Khmer Rouge. Cambodia endured its darkest hour – Democratic Kampuchea and the long aftermath of Vietnamese occupation, the People's Republic of Kampuchea and the UN Mandate towards Modern Cambodia since 1993.

Prehistory and early history
Radiocarbon dating of a cave at Laang Spean in Battambang Province, northwest Cambodia confirmed the presence of Hoabinhian stone tools from 6000 to 7000 BCE and pottery from 4200 BCE. Starting in 2009 archaeological research of the Franco-Cambodian Prehistoric Mission has documented a complete cultural sequence from 71.000 years BP to the Neolithic period in the cave. Finds since 2012 lead to the common interpretation, that the cave contains the archaeological remains of a first occupation by hunter and gatherer groups, followed by Neolithic people with highly developed hunting strategies and stone tool making techniques, as well as highly artistic pottery making and design, and with elaborate social, cultural, symbolic and exequial practices. Cambodia participated in the Maritime Jade Road, which was in place in the region for 3,000 years, beginning in 2000 BCE to 1000 CE.

Skulls and human bones found at Samrong Sen in Kampong Chhnang Province date from 1500 BCE. Heng Sophady (2007) has drawn comparisons between Samrong Sen and the circular earthwork sites of eastern Cambodia. These people may have migrated from South-eastern China to the Indochinese Peninsula. Scholars trace the first cultivation of rice and the first bronze making in Southeast Asia to these people.

2010 Examination of skeletal material from graves at Phum Snay in north-west Cambodia revealed an exceptionally high number of injuries, especially to the head, likely to have been caused by interpersonal violence. The graves also contain a quantity of swords and other offensive weapons used in conflict.

The Iron Age period of Southeast Asia begins around 500 BCE and lasts until the end of the Funan era - around 500 A.D. as it provides the first concrete evidence for sustained maritime trade and socio-political interaction with India and South Asia. By the 1st century settlers have developed complex, organised societies and a varied religious cosmology, that required advanced spoken languages very much related to those of the present day. The most advanced groups lived along the coast and in the lower Mekong River valley and the delta regions in houses on stilts where they cultivated rice, fished and kept domesticated animals.

Funan Kingdom (1st century – 550/627)

Chinese annals contain detailed records of the first known organised polity, the Kingdom of Funan, on Cambodian and Vietnamese territory characterised by "high population and urban centers, the production of surplus food...socio-political stratification [and] legitimized by Indian religious ideologies". Centered around the lower Mekong and Bassac rivers from the first to sixth century CE with "walled and moated cities" such as Angkor Borei in Takeo Province and Óc Eo in modern An Giang Province, Vietnam.

Early Funan was composed of loose communities, each with its own ruler, linked by a common culture and a shared economy of rice farming people in the hinterland and traders in the coastal towns, who were economically interdependent, as surplus rice production found its way to the ports.

By 1986 Funan controlled the strategic coastline of Indochina and the maritime trade routes. Cultural and religious ideas reached Funan via the Indian Ocean trade route. Trade with India had commenced well before 500 BCE as Sanskrit hadn't yet replaced Pali. Funan's language has been determined as to have been an early form of Khmer and its written form was Sanskrit.

In the period 2012-2013 dignitaries of the Chinese Kingdom of Wu visited the Funan city Vyadharapura. Envoys Kang Tai and Zhu Ying defined Funan as to be a distinct Hindu culture. Trade with China had begun after the southward expansion of the Han Dynasty, around the 2nd century BCE Effectively Funan "controlled strategic land routes in addition to coastal areas" and occupied a prominent position as an "economic and administrative hub" between The Indian Ocean trade network and China, collectively known as the Maritime Silk Road. Trade routes, that eventually ended in distant Rome are corroborated by Roman and Persian coins and artefacts, unearthed at archaeological sites of 2nd and 3rd century settlements.

Funan is associated with myths, such as the Kattigara legend and the Khmer founding legend in which an Indian Brahman or prince named Preah Thaong in Khmer, Kaundinya in Sanskrit and Hun-t’ien in Chinese records marries the local ruler, a princess named Nagi Soma (Lieu-Ye in Chinese records), thus establishing the first Cambodian royal dynasty.

Scholars debate as to how deep the narrative is rooted in actual events and on Kaundinya's origin and status. A Chinese document, that underwent 4 alterations and a 3rd-century epigraphic inscription of Champa are the contemporary sources. Some scholars consider the story to be simply an allegory for the diffusion of Indic Hindu and Buddhist beliefs into ancient local cosmology and culture whereas some historians dismiss it chronologically.

Chinese annals report that Funan reached its territorial climax in the early 3rd century under the rule of king Fan Shih-man, extending as far south as Malaysia and as far west as Burma. A system of mercantilism in commercial monopolies was established. Exports ranged from forest products to precious metals and commodities such as gold, elephants, ivory, rhinoceros horn, kingfisher feathers, wild spices like cardamom, lacquer, hides and aromatic wood. Under Fan Shih-man Funan maintained a formidable fleet and was administered by an advanced bureaucracy, based on a "tribute-based economy, that produced a surplus which was used to support foreign traders along its coasts and ostensibly to launch expansionist missions to the west and south".

Historians maintain contradicting ideas about Funan's political status and integrity. Miriam T. Stark calls it simply Funan: [The]"notion of Fu Nan as an early "state"...has been built largely by historians using documentary and historical evidence" and Michael Vickery remarks: "Nevertheless, it is...unlikely that the several ports constituted a unified state, much less an 'empire'". Other sources though, imply imperial status: "Vassal kingdoms spread to southern Vietnam in the east and to the Malay peninsula in the west" and "Here we will look at two empires of this period...Funan and Srivijaya".

The question of how Funan came to an end is in the face of almost universal scholarly conflict impossible to pin down. Chenla is the name of Funan's successor in Chinese annals, first appearing in 616/617 CE

The archaeological approach to and interpretation of the entire early historic period is considered to be a decisive supplement for future research. The "Lower Mekong Archaeological Project" focuses on the development of political complexity in this region during the early historic period. LOMAP survey results of 2003 to 2005, for example, have helped to determine that "...the region's importance continued unabated throughout the pre-Angkorian period...and that at least three [surveyed areas] bear Angkorian-period dates and suggest the continued importance of the delta."

Chenla Kingdom (6th century – 802)
The History of the Chinese Sui dynasty contains records that a state called Chenla sent an embassy to China in 616 or 617 CE It says, that Chenla was a vassal of Funan, but under its ruler Citrasena-Mahendravarman conquered Funan and gained independence.

Most of the Chinese recordings on Chenla, including that of Chenla conquering Funan, have been contested since the 1970s as they are generally based on single remarks in the Chinese annals, as author Claude Jacques emphasised the very vague character of the Chinese terms 'Funan' and 'Chenla', while more domestic epigraphic sources become available. Claude Jacques summarises: "Very basic historical mistakes have been made" because "the history of pre-Angkorean Cambodia was reconstructed much more on the basis of Chinese records than on that of [Cambodian] inscriptions" and as new inscriptions were discovered, researchers "preferred to adjust the newly discovered facts to the initial outline rather than to call the Chinese reports into question".

The notion of Chenla's centre being in modern Laos has also been contested. "All that is required is that it be inland from Funan." The most important political record of pre-Angkor Cambodia, the inscription K53 from Ba Phnom, dated 667 CE does not indicate any political discontinuity, either in royal succession of kings Rudravarman, Bhavavarman I, Mahendravarman [Citrasena], Īśānavarman, and Jayavarman I or in the status of the family of officials who produced the inscription. Another inscription of a few years later, K44, 674 CE, commemorating a foundation in Kampot province under the patronage of Jayavarman I, refers to an earlier foundation in the time of King Raudravarma, presumably Rudravarman of Funan, and again there is no suggestion of political discontinuity.

The History of the T'ang asserts that shortly after 706 the country was split into Land Chenla and Water Chenla. The names signify a northern and a southern half, which may conveniently be referred to as Upper and Lower Chenla.

By the late 8th century Water Chenla had become a vassal of the Sailendra dynasty of Java – the last of its kings were killed and the polity incorporated into the Javanese monarchy around 790 CE. Land Chenla acquired independence under Jayavarman II in 802 CE

Ancient Chinese records mention two kings, Shrutavarman and Shreshthavarman who ruled at the capital Shreshthapura located in modern-day southern Laos. The immense influence on the identity of Cambodia to come was wrought by the Khmer Kingdom of Bhavapura, in the modern day Cambodian city of Kampong Thom. Its legacy was its most important sovereign, Ishanavarman who completely conquered the kingdom of Funan during 612–628. He chose his new capital at the Sambor Prei Kuk, naming it Ishanapura.

Khmer Empire (802–1431)

The six centuries of the Khmer Empire are characterised by unparalleled technical and artistic progress and achievements, political integrity and administrative stability. The empire represents the cultural and technical apogee of the Cambodian and Southeast Asian pre-industrial civilisation. The Khmer Empire was preceded by Chenla, a polity with shifting centres of power, which was split into Land Chenla and Water Chenla in the early 8th century. By the late 8th century Water Chenla was absorbed by the Malays of the Srivijaya Empire and the Javanese of the Shailandra Empire and eventually incorporated into Java and Srivijaya. Jayavarman II, ruler of Land Chenla, initiates a mythical Hindu consecration ceremony at Mount Kulen (Mount Mahendra) in 802 CE, intended to proclaim political autonomy and royal legitimacy. As he declared himself devaraja - god-king, divinely appointed and uncontested, he simultaneously declares independence from Shailandra and Srivijaya. He established Hariharalaya, the first capital of the Angkorean area near the modern town of Roluos.

Indravarman I (877–889) and his son and successor Yasovarman I (889–900), who established the capital Yasodharapura ordered the construction of huge water reservoirs (barays) north of the capital. The water management network depended on elaborate configurations of channels, ponds, and embankments built from huge quantities of clayey sand, the available bulk material on the Angkor plain. Dikes of the East Baray still exist today, which are more than 7 km long and 1.8 km wide. The largest component is the West Baray, a reservoir about 8 km long and 2 km across, containing approximately 50 million m3 of water. Royal administration was based on the religious idea of the Shivaite Hindu state and the central cult of the sovereign as warlord and protector – the "Varman". This centralised system of governance appointed royal functionaries to provinces. The Mahidharapura dynasty – its first king was Jayavarman VI (1080 to 1107), which originated west of the Dângrêk Mountains in the Mun river valley discontinued the old "ritual policy", genealogical traditions and crucially, Hinduism as exclusive state religion. Some historians relate the empires' decline to these religious discontinuities.

The area that comprises the various capitals was spread out over around 1000 km2, it is nowadays commonly called Angkor. The combination of sophisticated wet-rice agriculture, based on an engineered irrigation system and the Tonlé Sap's spectacular abundance in fish and aquatic fauna, as protein source guaranteed a regular food surplus. Recent Geo-surveys have confirmed that Angkor maintained the largest pre-industrial settlement complex worldwide during the 12th and 13th centuries – some three quarters of a million people lived there. Sizeable contingents of the public workforce were to be redirected to monument building and infrastructure maintenance. A growing number of researchers relates the progressive over-exploitation of the delicate local eco-system and its resources alongside large scale deforestation and resulting erosion to the empires' eventual decline.

Under king Suryavarman II (1113–1150) the empire reached its greatest geographic extent as it directly or indirectly controlled Indochina, the Gulf of Thailand and large areas of northern maritime Southeast Asia. Suryavarman II commissioned the temple of Angkor Wat, built in a period of 37 years, its five towers representing Mount Meru is considered to be the most accomplished expression of classical Khmer architecture. However, territorial expansion ended when Suryavarman II was killed in battle attempting to invade Đại Việt. It was followed by a period of dynastic upheaval and a Cham invasion that culminated in the sack of Angkor in 1177.

King Jayavarman VII (reigned 1181–1219) is generally considered to be Cambodia's greatest King. A Mahayana Buddhist, he initiates his reign by striking back against Champa in a successful campaign. During his nearly forty years in power he becomes the most prolific monument builder, who establishes the city of Angkor Thom with its central temple the Bayon. Further outstanding works are attributed to him – Banteay Kdei, Ta Prohm, Neak Pean and Sra Srang. The construction of an impressive number of utilitarian and secular projects and edifices, such as maintenance of the extensive road network of Suryavarman I, in particular the royal road to Phimai and the many rest houses, bridges and hospitals make Jayavarman VII unique among all imperial rulers.

In August 1296, the Chinese diplomat Zhou Daguan arrived at Angkor and remained at the court of king Srindravarman until July 1297. He wrote a detailed report, The Customs of Cambodia, on life in Angkor. His portrayal is one of the most important sources of understanding historical Angkor as the text offers valuable information on the everyday life and the habits of the inhabitants of Angkor.

The last Sanskrit inscription is dated 1327, and records the succession of Indrajayavarman by Jayavarman IX Parameshwara (1327–1336).

The empire was an agrarian state that consisted essentially of three social classes, the elite, workers and slaves. The elite included advisers, military leaders, courtiers, priests, religious ascetics and officials. Workers included agricultural labourers and also a variety of craftsman for construction projects. Slaves were often captives from military campaigns or distant villages. Coinage did not exist and the barter economy was based on agricultural produce, principally rice, with regional trade as an insignificant part of the economy.

Post-Angkor Period of Cambodia (1431–1863)
The term "Post-Angkor Period of Cambodia", also the "Middle Period" refers to the historical era from the early 15th century to 1863, the beginning of the French Protectorate of Cambodia. Reliable sources – particularly for the 15th and 16th century – are very rare. A conclusive explanation that relates to concrete events manifesting the decline of the Khmer Empire has not yet been produced. However, most modern historians contest that several distinct and gradual changes of religious, dynastic, administrative and military nature, environmental problems and ecological imbalance coincided with shifts of power in Indochina and must all be taken into account to make an interpretation. In recent years, focus has notably shifted towards studies on climate changes, human–environment interactions and the ecological consequences.

Epigraphy in temples, ends in the third decade of the fourteenth, and does not resume until the mid-16th century. Recording of the Royal Chronology discontinues with King Jayavarman IX Parameshwara (or Jayavarma-Paramesvara) – there exists not a single contemporary record of even a king's name for over 200 years. Construction of monumental temple architecture had come to a standstill after Jayavarman VII's reign. According to author Michael Vickery there only exist external sources for Cambodia's 15th century, the Chinese Ming Shilu annals and the earliest Royal Chronicle of Ayutthaya. Wang Shi-zhen (王世貞), a Chinese scholar of the 16th century, remarked: "The official historians are unrestrained and are skilful at concealing the truth; but the memorials and statutes they record and the documents they copy cannot be discarded."

The central reference point for the entire 15th century is a Siamese intervention of some undisclosed nature at the capital Yasodharapura (Angkor Thom) around the year 1431. Historians relate the event to the shift of Cambodia's political centre southward to the region of Phnom Penh, Longvek and later Oudong.

Sources for the 16th century are more numerous. The kingdom is centred at the Mekong, prospering as an integral part of the Asian maritime trade network, via which the first contact with European explorers and adventurers does occur. Wars with the Siamese result in loss of territory and eventually the conquest of the capital Longvek in 1594. Richard Cocks, of the East India Company established trade with Cochin, China, and Cambodia by 1618, but the Cambodia commerce was not authorized by the directors in London and was short-lived until it was revived in 1651, again without authorization. The Vietnamese on their "Southward March" reach Prei Nokor/Saigon at the Mekong Delta in the 17th century. This event initiates the slow process of Cambodia losing access to the seas and independent marine trade.

Siamese and Vietnamese dominance intensified during the 17th and 18th century, resulting in frequent displacements of the seat of power as the Khmer royal authority decreased to the state of a vassal. In the early 19th century with dynasties in Vietnam and Siam firmly established, Cambodia was placed under joint suzerainty, having lost its national sovereignty. British agent John Crawfurd states: "...the King of that ancient Kingdom is ready to throw himself under the protection of any European nation..." To save Cambodia from being incorporated into Vietnam and Siam, the Cambodians entreated the aid of the Luzones/Lucoes (Filipinos from Luzon-Philippines) that previously participated in the Burmese-Siamese wars as mercenaries. When the embassy arrived in Luzon, the rulers were now Spaniards, so they asked them for aid too, together with their Latin American troops imported from Mexico, in order to restore the then Christianised King, Satha II, as monarch of Cambodia, this, after a Thai/Siamese invasion was repelled. However that was only temporary. Nevertheless, the future King, Ang Duong, also enlisted the aid of the French who were allied to the Spanish (As Spain was ruled by a French royal dynasty the Bourbons). The Cambodian king agreed to colonial France's offers of protection in order to restore the existence of the Cambodian monarchy, which took effect with King Norodom Prohmbarirak signing and officially recognising the French protectorate on 11 August 1863.

French colonial period (1863–1953)
In August 1863 King Norodom signed an agreement with the French placing the kingdom under the protection of France. The original treaty left Cambodian sovereignty intact, but French control gradually increased, with important landmarks in 1877, 1884, and 1897, until by the end of the century the king's authority no longer existed outside the palace. Norodom died in 1904, and his two successors, Sisowath and Monivong, were content to allow the French to control the country, but in 1940 France was defeated in a brief border war with Thailand and forced to surrender the provinces of Battambang and Angkor (the ancient site of Angkor itself was retained). King Monivong died in April 1941, and the French placed the obscure Prince Sihanouk on the throne as king, believing that the inexperienced 18-year old would be more pliable than Monivong's middle-aged son, Prince Monireth.

Cambodia's situation at the end of the war was chaotic. The Free French, under General Charles de Gaulle, were determined to recover Indochina, though they offered Cambodia and the other Indochinese protectorates a carefully circumscribed measure of self-government. Convinced that they had a "civilizing mission", they envisioned Indochina's participation in a French Union of former colonies that shared the common experience of French culture.

Administration of Sihanouk (1953–70)
On 9 March 1945, during the Japanese occupation of Cambodia, young king Norodom Sihanouk proclaimed an independent Kingdom of Kampuchea, following a formal request by the Japanese. Shortly thereafter the Japanese government nominally ratified the independence of Cambodia and established a consulate in Phnom Penh. The new government did away with the romanization of the Khmer language that the French colonial administration was beginning to enforce and officially reinstated the Khmer script. This measure taken by the short-lived governmental authority would be popular and long-lasting, for since then no government in Cambodia has tried to romanise the Khmer language again. After Allied military units entered Cambodia, the Japanese military forces present in the country were disarmed and repatriated. The French were able to reimpose the colonial administration in Phnom Penh in October the same year. Sihanouk's "royal crusade for independence" resulted in grudging French acquiescence to his demands for a transfer of sovereignty. A partial agreement was struck in October 1953. Sihanouk then declared that independence had been achieved and returned in triumph to Phnom Penh. As a result of the 1954 Geneva Conference on Indochina, Cambodia was able to bring about the withdrawal of the Viet Minh troops from its territory and to withstand any residual impingement upon its sovereignty by external powers.

Neutrality was the central element of Cambodian foreign policy during the 1950s and 1960s. By the mid-1960s, parts of Cambodia's eastern provinces were serving as bases for North Vietnamese Army and National Liberation Front (NVA/NLF) forces operating against South Vietnam, and the port of Sihanoukville was being used to supply them. As NVA/VC activity grew, the United States and South Vietnam became concerned, and in 1969, the United States began a 14-month-long series of bombing raids targeted at NVA/VC elements, contributing to destabilisation. The bombing campaign took place no further than ten, and later 20 mi inside the Cambodian border, areas where the Cambodian population had been evicted by the NVA. Prince Sihanouk, fearing that the conflict between communist North Vietnam and South Vietnam might spill over to Cambodia, publicly opposed the idea of a bombing campaign by the United States along the Vietnam–Cambodia border and inside Cambodian territory. However, Peter Rodman claimed, "Prince Sihanouk complained bitterly to us about these North Vietnamese bases in his country and invited us to attack them". In December 1967 Washington Post journalist Stanley Karnow was told by Sihanouk that if the US wanted to bomb the Vietnamese communist sanctuaries, he would not object, unless Cambodians were killed. The same message was conveyed to US President Johnson's emissary Chester Bowles in January 1968. So the US had no real motivation to overthrow Sihanouk. However, Prince Sihanouk wanted Cambodia to stay out of the North Vietnam–South Vietnam conflict and was very critical of the United States government and its allies (the South Vietnamese government). Prince Sihanouk, facing internal struggles of his own, due to the rise of the Khmer Rouge, did not want Cambodia to be involved in the conflict. Sihanouk wanted the United States and its allies (South Vietnam) to keep the war away from the Cambodian border. Sihanouk did not allow the United States to use Cambodian air space and airports for military purposes. This upset the United States greatly and contributed to their view of Prince Sihanouk as a North Vietnamese sympathiser and a thorn on the United States. However, declassified documents indicate that, as late as March 1970, the Nixon administration was hoping to garner "friendly relations" with Sihanouk.

Throughout the 1960s, domestic Cambodian politics became polarised. Opposition to the government grew within the middle class and leftists including Paris-educated leaders like Son Sen, Ieng Sary, and Saloth Sar (later known as Pol Pot), who led an insurgency under the clandestine Communist Party of Kampuchea (CPK). Sihanouk called these insurgents the Khmer Rouge, literally the "Red Khmer". But the 1966 national assembly elections showed a significant swing to the right, and General Lon Nol formed a new government, which lasted until 1967. During 1968 and 1969, the insurgency worsened. However, members of the government and army, who resented Sihanouk's ruling style as well as his tilt away from the United States, did have a motivation to overthrow him.

Khmer Republic and the War (1970–75)
While visiting Beijing in 1970 Sihanouk was ousted by a military coup led by Prime Minister General Lon Nol and Prince Sisowath Sirik Matak in the early hours of 18 March 1970. However, as early as 12 March 1970, the CIA Station Chief told Washington that based on communications from Sirik Matak, Lon Nol's cousin, that "the (Cambodian) army was ready for a coup". Lon Nol assumed power after the military coup and immediately allied Cambodia with the United States. Son Ngoc Thanh, an opponent of Pol Pot, announced his support for the new government. On 9 October, the Cambodian monarchy was abolished, and the country was renamed the Khmer Republic. The new regime immediately demanded that the Vietnamese communists leave Cambodia.

Hanoi rejected the new republic's request for the withdrawal of NVA troops. In response, the United States moved to provide material assistance to the new government's armed forces, which were engaged against both CPK insurgents and NVA forces. The North Vietnamese and Viet Cong forces, desperate to retain their sanctuaries and supply lines from North Vietnam, immediately launched armed attacks on the new government. The North Vietnamese quickly overran large parts of eastern Cambodia, reaching to within 15 mi of Phnom Penh. The North Vietnamese turned the newly won territories over to the Khmer Rouge. The king urged his followers to help in overthrowing this government, hastening the onset of civil war. In April 1970, US President Richard Nixon announced to the American public that US and South Vietnamese ground forces had entered Cambodia in a campaign aimed at destroying NVA base areas in Cambodia (see Cambodian Incursion). The US had already been bombing Vietnamese positions in Cambodia for well over a year by that point. Although a considerable quantity of equipment was seized or destroyed by US and South Vietnamese forces, containment of North Vietnamese forces proved elusive.

The Khmer Republic's leadership was plagued by disunity among its three principal figures: Lon Nol, Sihanouk's cousin Sirik Matak, and National Assembly leader In Tam. Lon Nol remained in power in part because none of the others were prepared to take his place. In 1972, a constitution was adopted, a parliament elected, and Lon Nol became president. But disunity, the problems of transforming a 30,000-man army into a national combat force of more than 200,000 men, and spreading corruption weakened the civilian administration and army. The Khmer Rouge insurgency inside Cambodia continued to grow, aided by supplies and military support from North Vietnam. Pol Pot and Ieng Sary asserted their dominance over the Vietnamese-trained communists, many of whom were purged. At the same time, the Khmer Rouge (CPK) forces became stronger and more independent of their Vietnamese patrons. By 1973, the CPK were fighting battles against government forces with little or no North Vietnamese troop support, and they controlled nearly 60% of Cambodia's territory and 25% of its population. The government made three unsuccessful attempts to enter into negotiations with the insurgents, but by 1974, the CPK was operating openly as divisions, and some of the NVA combat forces had moved into South Vietnam. Lon Nol's control was reduced to small enclaves around the cities and main transportation routes. More than two million refugees from the war lived in Phnom Penh and other cities.

On New Year's Day 1975, Communist troops launched an offensive which, in 117 days of the hardest fighting of the war, caused the collapse of the Khmer Republic. Simultaneous attacks around the perimeter of Phnom Penh pinned down Republican forces, while other CPK units overran fire bases controlling the vital lower Mekong resupply route. A US-funded airlift of ammunition and rice ended when Congress refused additional aid for Cambodia. The Lon Nol government in Phnom Penh surrendered on 17 April 1975, just five days after the US mission evacuated Cambodia.

Foreign involvement in the rise of the Khmer Rouge
The relationship between the massive carpet bombing of Cambodia by the United States and the growth of the Khmer Rouge, in terms of recruitment and popular support, has been a matter of interest to historians. Some historians, including Michael Ignatieff, Adam Jones and Greg Grandin, have cited the United States intervention and bombing campaign (spanning 1965–1973) as a significant factor which lead to increased support for the Khmer Rouge among the Cambodian peasantry. According to Ben Kiernan, the Khmer Rouge "would not have won power without U.S. economic and military destabilization of Cambodia. ... It used the bombing's devastation and massacre of civilians as recruitment propaganda and as an excuse for its brutal, radical policies and its purge of moderate communists and Sihanoukists." Pol Pot biographer David P. Chandler writes that the bombing "had the effect the Americans wanted – it broke the Communist encirclement of Phnom Penh", but it also accelerated the collapse of rural society and increased social polarization. Peter Rodman and Michael Lind claimed that the United States intervention saved the Lon Nol regime from collapse in 1970 and 1973. Craig Etcheson acknowledged that U.S. intervention increased recruitment for the Khmer Rouge but disputed that it was a primary cause of the Khmer Rouge victory. William Shawcross wrote that the United States bombing and ground incursion plunged Cambodia into the chaos that Sihanouk had worked for years to avoid.

By 1973, Vietnamese support of the Khmer Rouge had largely disappeared. China "armed and trained" the Khmer Rouge both during the civil war and the years afterward.

Owing to Chinese, U.S., and Western support, the Khmer Rouge-dominated Coalition Government of Democratic Kampuchea (CGDK) held Cambodia's UN seat until 1993, long after the Cold War had ended. China has defended its ties with the Khmer Rouge. Chinese Foreign Ministry spokeswoman Jiang Yu said that "the government of Democratic Kampuchea had a legal seat at the United Nations, and had established broad foreign relations with more than 70 countries".

Democratic Kampuchea (Khmer Rouge era) (1975–79)
Immediately after its victory, the CPK ordered the evacuation of all cities and towns, sending the entire urban population into the countryside to work as farmers, as the CPK was trying to reshape society into a model that Pol Pot had conceived.

The new government sought to completely restructure Cambodian society. Remnants of the old society were abolished and religion was suppressed. Agriculture was collectivised, and the surviving part of the industrial base was abandoned or placed under state control. Cambodia had neither a currency nor a banking system.

Within the CPK, the Paris-educated leadership—Pol Pot, Ieng Sary, Nuon Chea, and Son Sen—were in control. A new constitution in January 1976 established Democratic Kampuchea as a Communist People's Republic, and a 250-member Assembly of the Representatives of the People of Kampuchea (PRA) was selected in March to choose the collective leadership of a State Presidium, the chairman of which became the head of state.

Prince Sihanouk resigned as head of state on 2 April. On 14 April, after its first session, the PRA announced that Khieu Samphan would chair the State Presidium for a 5-year term. It also picked a 15-member cabinet headed by Pol Pot as prime minister. Prince Sihanouk was put under virtual house arrest.

Democratic Kampuchea's relations with Vietnam and Thailand worsened rapidly as a result of border clashes and ideological differences. While communist, the CPK was fiercely nationalistic, and most of its members who had lived in Vietnam were purged. Democratic Kampuchea established close ties with the People's Republic of China, and the Cambodian-Vietnamese conflict became part of the Sino-Soviet rivalry, with Moscow backing Vietnam. Border clashes worsened when the Democratic Kampuchea military attacked villages in Vietnam. The regime broke off relations with Hanoi in December 1977, protesting Vietnam's alleged attempt to create an Indochina Federation. In mid-1978, Vietnamese forces invaded Cambodia, advancing about 30 mi before the arrival of the rainy season.

The reasons for Chinese support of the CPK was to prevent a pan-Indochina movement, and maintain Chinese military superiority in the region. The Soviet Union supported a strong Vietnam to maintain a second front against China in case of hostilities and to prevent further Chinese expansion. Since Stalin's death, relations between Mao-controlled China and the Soviet Union had been lukewarm at best. In February to March 1979, China and Vietnam would fight the brief Sino-Vietnamese War over the issue.

In December 1978, Vietnam announced the formation of the Kampuchean United Front for National Salvation (KUFNS) under Heng Samrin, a former DK division commander. It was composed of Khmer Communists who had remained in Vietnam after 1975 and officials from the eastern sector—like Heng Samrin and Hun Sen—who had fled to Vietnam from Cambodia in 1978. In late December 1978, Vietnamese forces launched a full invasion of Cambodia, capturing Phnom Penh on 7 January 1979 and driving the remnants of Democratic Kampuchea's army westward toward Thailand.

Destruction and deaths caused by the regime
20,000 people died of exhaustion or disease during the evacuation of Phnom Penh and its aftermath. Many of those forced to evacuate the cities were resettled in newly created villages, which lacked food, agricultural implements, and medical care. Many who lived in cities had lost the skills necessary for survival in an agrarian environment. Thousands starved before the first harvest. Hunger and malnutrition—bordering on starvation—were constant during those years. Most military and civilian leaders of the former regime who failed to disguise their pasts were executed.

Some of the ethnicities in Cambodia, such as the Cham and Vietnamese, suffered specific and targeted and violent persecutions, to the point of some international sources referring to it as the "Cham genocide". Entire families and towns were targeted and attacked with the goal of significantly diminishing their numbers and eventually eliminated them. Life in 'Democratic Kampuchea' was strict and brutal. In many areas of the country people were rounded up and executed for speaking a foreign language, wearing glasses, scavenging for food, absent for government assigned work, and even crying for dead loved ones. Former businessmen and bureaucrats were hunted down and killed along with their entire families; the Khmer Rouge feared that they held beliefs that could lead them to oppose their regime. A few Khmer Rouge loyalists were even killed for failing to find enough 'counter-revolutionaries' to execute. When Cambodian socialists began to rebel in the eastern zone of Cambodia, Pol Pot ordered his armies to exterminate 1.5 million eastern Cambodians which he branded as "Cambodians with Vietnamese minds" in the area. The purge was done speedily and efficiently as Pol Pot's soldiers quickly killed at least more than 100,000 to 250,000 eastern Cambodians right after deporting them to execution site locations in Central, North and North-Western Zones within a month's time, making it the bloodiest episode of mass murder under Pol Pot's regime.

Religious institutions were not spared by the Khmer Rouge as well, in fact religion was so viciously persecuted to such an extent that the vast majority of Cambodia's historic architecture, 95% of Cambodia's Buddhist temples, was completely destroyed.

Ben Kiernan estimates that 1.671 million to 1.871 million Cambodians died as a result of Khmer Rouge policy, or between 21% and 24% of Cambodia's 1975 population. A study by French demographer Marek Sliwinski calculated slightly fewer than 2 million unnatural deaths under the Khmer Rouge out of a 1975 Cambodian population of 7.8 million; 33.5% of Cambodian men died under the Khmer Rouge compared to 15.7% of Cambodian women. According to a 2001 academic source, the most widely accepted estimates of excess deaths under the Khmer Rouge range from 1.5 million to 2 million, although figures as low as 1 million and as high as 3 million have been cited; conventionally accepted estimates of deaths due to Khmer Rouge executions range from 500,000 to 1 million, "a third to one half of excess mortality during the period." However, a 2013 academic source (citing research from 2009) indicates that execution may have accounted for as much as 60% of the total, with 23,745 mass graves containing approximately 1.3 million suspected victims of execution. While considerably higher than earlier and more widely accepted estimates of Khmer Rouge executions, the Documentation Center of Cambodia (DC-Cam)'s Craig Etcheson defended such estimates of over one million executions as "plausible, given the nature of the mass grave and DC-Cam's methods, which are more likely to produce an under-count of bodies rather than an over-estimate." Demographer Patrick Heuveline estimated that between 1.17 million and 3.42 million Cambodians died unnatural deaths between 1970 and 1979, with between 150,000 and 300,000 of those deaths occurring during the civil war. Heuveline's central estimate is 2.52 million excess deaths, of which 1.4 million were the direct result of violence. Despite being based on a house-to-house survey of Cambodians, the estimate of 3.3 million deaths promulgated by the Khmer Rouge's successor regime, the People's Republic of Kampuchea (PRK), is generally considered to be an exaggeration; among other methodological errors, the PRK authorities added the estimated number of victims that had been found in the partially-exhumed mass graves to the raw survey results, meaning that some victims would have been double-counted.

An estimated 300,000 Cambodians starved to death between 1979 and 1980, largely as a result of the after-effects of Khmer Rouge policies.

Vietnamese occupation and the PRK (1979–93)
On 10 January 1979, after the Vietnamese army and the KUFNS (Kampuchean United Front for National Salvation) invaded Cambodia and overthrew the Khmer Rouge, the new People's Republic of Kampuchea (PRK) was established with Heng Samrin as head of state. Pol Pot's Khmer Rouge forces retreated rapidly to the jungles near the Thai border. The Khmer Rouge and the PRK began a costly struggle that played into the hands of the larger powers China, the United States and the Soviet Union. The Khmer People's Revolutionary Party's rule gave rise to a guerrilla movement of three major resistance groups – the FUNCINPEC (Front Uni National pour un Cambodge Indépendant, Neutre, Pacifique, et Coopératif), the KPLNF (Khmer People's National Liberation Front) and the PDK (Party of Democratic Kampuchea, the Khmer Rouge under the nominal presidency of Khieu Samphan). "All held dissenting perceptions concerning the purposes and modalities of Cambodia's future". Civil war displaced 600,000 Cambodians, who fled to refugee camps along the border to Thailand and tens of thousands of people were murdered throughout the country.

Peace efforts began in Paris in 1989 under the State of Cambodia, culminating two years later in October 1991 in a comprehensive peace settlement. The United Nations was given a mandate to enforce a ceasefire and deal with refugees and disarmament known as the United Nations Transitional Authority in Cambodia (UNTAC).

Modern Cambodia (1993–present)
On 23 October 1991, the Paris Conference reconvened to sign a comprehensive settlement giving the UN full authority to supervise a cease-fire, repatriate the displaced Khmer along the border with Thailand, disarm and demobilise the factional armies, and prepare the country for free and fair elections. Prince Sihanouk, President of the Supreme National Council of Cambodia (SNC), and other members of the SNC returned to Phnom Penh in November 1991, to begin the resettlement process in Cambodia. The UN Advance Mission for Cambodia (UNAMIC) was deployed at the same time to maintain liaison among the factions and begin demining operations to expedite the repatriation of approximately 370,000 Cambodians from Thailand.

On 16 March 1992, the UN Transitional Authority in Cambodia (UNTAC) arrived in Cambodia to begin implementation of the UN settlement plan and to become operational on 15 March 1992 under Yasushi Akashi, the Special Representative of the U.N. Secretary General. UNTAC grew into a 22,000-strong civilian and military peacekeeping force tasked to ensure the conduct of free and fair elections for a constituent assembly. Over 4 million Cambodians (about 90% of eligible voters) participated in the May 1993 elections. Pre-election violence and intimidation was widespread, caused by SOC (State of Cambodia – made up largely of former PDK cadre) security forces, mostly against the FUNCINPEC and BLDP parties according to UNTAC. The Khmer Rouge or Party of Democratic Kampuchea (PDK), whose forces were never actually disarmed or demobilized blocked local access to polling places. Prince Ranariddh's (son of Norodom Sihanouk) royalist Funcinpec Party was the top vote recipient with 45.5% of the vote, followed by Hun Sen's Cambodian People's Party and the Buddhist Liberal Democratic Party, respectively. Funcinpec then entered into a coalition with the other parties that had participated in the election. A coalition government resulted between the Cambodian People's Party and FUNCINPEC, with two co-prime ministers – Hun Sen, since 1985 the prime minister in the Communist government, and Norodom Ranariddh.

The parties represented in the 120-member assembly proceeded to draft and approve a new constitution, which was promulgated 24 September 1993. It established a multiparty liberal democracy in the framework of a constitutional monarchy, with the former Prince Sihanouk elevated to King. Prince Ranariddh and Hun Sen became First and Second Prime Ministers, respectively, in the Royal Cambodian Government (RGC). The constitution provides for a wide range of internationally recognised human rights.

Hun Sen and his government have seen much controversy. Hun Sen was a former Khmer Rouge commander who was originally installed by the Vietnamese and, after the Vietnamese left the country, maintains his strong man position by violence and oppression when deemed necessary. In 1997, fearing the growing power of his co-Prime Minister, Prince Norodom Ranariddh, Hun launched a coup, using the army to purge Ranariddh and his supporters. Ranariddh was ousted and fled to Paris while other opponents of Hun Sen were arrested, tortured and some summarily executed.

On 4 October 2004, the Cambodian National Assembly ratified an agreement with the United Nations on the establishment of a tribunal to try senior leaders responsible for the atrocities committed by the Khmer Rouge. International donor countries have pledged a US$43 Million share of the three-year tribunal budget as Cambodia contributes US$13.3 Million. The tribunal has sentenced several senior Khmer Rouge leaders since 2008.

Cambodia is still infested with countless land mines, indiscriminately planted by all warring parties during the decades of war and upheaval.

The Cambodia National Rescue Party was dissolved ahead of the 2018 Cambodian general election and the ruling Cambodian People's Party also enacted tighter curbs on mass media. The CPP won every seat in the National Assembly without a major opposition, effectively solidifying de facto one-party rule in the country.

Cambodia’s longtime Prime Minister Hun Sen, one of the world’s longest-serving leaders, has a very firm grip on power. He has been accused of the crackdown on opponents and critics. His Cambodian People’s Party (CPP) has been in power since 1979. In December 2021, Prime Minister Hun Sen announced his support for his son Hun Manet to succeed him after the next election, which is expected to take place in 2023.

In July 2023 election, the ruling Cambodian People’s Party (CPP) easily won by landslide in flawed election, after disqualification of Cambodia’s most important opposition, Candlelight Party. On 22 August 2023, Hun Manet was sworn in as the new Cambodian prime minister.

title: History of Cambodia


text:
Geography of Cambodia

Cambodia is a country in mainland Southeast Asia. It borders Thailand, Laos, Vietnam, the Gulf of Thailand and covers a total area of approximately 181,035 km2. The country is situated in its entirety inside the tropical Indomalayan realm and the Indochina Time zone (ICT).

Cambodia's main geographical features are the low lying Central Plain that includes the Tonlé Sap basin, the lower Mekong River flood-plains and the Bassac River plain surrounded by mountain ranges to the north, east, in the south-west and south. The central lowlands extend into Vietnam to the south-east. The south and south-west of the country constitute a 443 km long coast at the Gulf of Thailand, characterized by sizable mangrove marshes, peninsulas, sandy beaches and headlands and bays. Cambodia's territorial waters account for over 50 islands. The highest peak is Phnom Aural, sitting 1810 m above sea level.

The landmass is bisected by the Mekong River, which at 486 km is the longest river in Cambodia. After extensive rapids, turbulent sections and cataracts in Laos, the river enters the country at Stung Treng province, is predominantly calm and navigable during the entire year as it widens considerably in the lowlands. The Mekong's waters disperse into the surrounding wetlands of central Cambodia and strongly affect the seasonal nature of the Tonlé Sap lake.

Two third of the country's population live in the lowlands, where the rich sediment deposited during the Mekong's annual flooding makes the agricultural lands highly fertile. As deforestation and over-exploitation affected Cambodia only in recent decades, forests, low mountain ranges and local eco-regions still retain much of their natural potential and although still home to the largest areas of contiguous and intact forests in mainland Southeast Asia, multiple serious environmental issues persist and accumulate, which are closely related to rapid population growth, uncontrolled globalization and inconsequential administration.

The majority of the country lies within the Tropical savanna climate zone, as the coastal areas in the South and West receive noticeably more and steady rain before and during the wet season. These areas constitute the easternmost fringes of the south-west monsoon, determined to be inside the Tropical monsoon climate. Countrywide there are two seasons of relatively equal length, defined by varying precipitation as temperatures and humidity are generally high and steady throughout the entire year.

Geological development

Mainland Southeast Asia consists of allochthonous continental blocks from Gondwanaland. These include the South China, Indochina, Sibumasu, and West Burma blocks, which amalgamated to form the Southeast Asian continent during the Paleozoic and Mesozoic periods.

The current geological structure of South China and South-East Asia is determined to be the response to the "Indo-sinian" collision in South-East Asia during the Carboniferous. The Indo-Sinian orogeny was followed by extension of the Indo-Chinese block, the formation of rift basins and thermal subsidence during the early Triassic.

The Indochina continental block, which is separated from the South China Block by the Jinshajiang-Ailaoshan Suture zone, is an amalgamation of the Viet-Lao, Khorat-Kontum, Uttaradit (UTD), and Chiang Mai-West Kachin terranes, all of which are separated by suture zones or ductile shear zones. The Khorat-Kontum terrane, which includes western Laos, Cambodia and southern Vietnam, consists of the Kontum metamorphic complex, Paleozoic shallow marine deposits, upper Permian arc volcanic rocks and Mesozoic terrigenous sedimentary rocks.

The central plains consist mainly of Quaternary sands, loam and clay, as most of the northern mountain regions and the coastal region are largely composed of Cretaceous granite, Triassic stones and Jurassic sandstone formations.

General topography

Bowl- or saucer-shaped, Cambodia covers 181035 km2 in the south-western part of the Indochinese peninsula as its landmass and marine territory is situated entirely within the tropics.

The bowl's bottom represents Cambodia's interior, about 75 percent, consisting of alluvial flood-plains of the Tonlé Sap basin, the lower Mekong River and the Bassac River plain, whose waters feed the large and almost centrally located wetlands. As humans preferably settle in these fertile and easily accessible central lowlands, major transformations and widespread cultivation through wet-rice agriculture have over the centuries shaped the landscape into distinctive regional cultivated lands.

Domestic plants, such as sugar palms, Coconut trees and banana groves almost exclusively skirt extensive rice paddies, as natural vegetation is confined to elevated lands and near waterways. The Mekong traverses the north to south-east portions of the country, where the low-lying plains extend into Vietnam and reach the South China Sea at the Mekong Delta region.

Cambodia's low mountain ranges - representing the walls of the bowl - remain as the result of only rather recent substantial infrastructural development and economic exploitation - in particular in remote areas - formidably forested. The country is fringed to the north by the Dangrek Mountains plateau, bordering Thailand and Laos, to the north-east by the Annamite Range, in the south-west by the Cardamom Mountains and in the South by the Elephant Mountains. Highlands to the north-east and to the east merge into the Central Highlands and the Mekong Delta lowlands of Vietnam.

A heavily indented coastline at the Gulf of Thailand of 443 km length and 60 offshore islands, that dot the territorial waters and locally merge with tidal mangrove marshes - the environmental basis for a remarkable range of marine and coastal eco-regions.

Soils
"Sandy materials cover a large proportion of the landscape of Cambodia, on account of the siliceous sedimentary formations that underlie much of the Kingdom. Mesozoic sandstone dominates most of the basement geology in Cambodia and hence has a dominating influence on the properties of upland soils. Arenosols (sandy soils featuring very weak or no soil development) are mapped on only 1.6% of the land area."

"Sandy surface textures are more prevalent than the deep sandy soils that fit the definition for Arenosols. Sandy textured profiles are common amongst the most prevalent soil groups, including Acrisols and Leptosols. The Acrisols are the most prevalent soil group occupying the lowlands - nearly half of the land area of Cambodia. Low fertility and toxic amounts of aluminium pose limitations to its agricultural use, crops that can be successfully cultivated include rubber tree, oil palm, coffee and sugar cane. The main subgroups are: Gleyic Acrisols (20.5%, Haplic Acrisols (13.3%), Plinthic Acrisol (8.7%) and Ferric Acrisol (6.3%)."

Geographical extremes

 * Northernmost point: Ta Veaeng District, Rattanakiri Province (14.68333°N, 107.53333°W)
 * Southernmost point: Koh Poulo Wai, Kampot Province (9.9°N, 102.88333°W)
 * Easternmost point: Ou Ya Dav District, Rattanakiri Province (13.36667°N, 107.61667°W)
 * Westernmost point: Malai District, Banteay Meanchey Province (13.88333°N, 102.55°W)

Central plain

The vast alluvial and lacustrine interconnected Cambodian flood-plain is a geologically relatively recent depression where the sediments of the Mekong and its tributaries accumulate as waters are subject to frequent course changes. The area covers 25069 km2. The Tonlé Sap lake and - river system occupies the lowest area. The Tonlé Sap River is a waterway that branches off the Mekong near Phnom Penh in the north-westerly direction and meets the Tonle Sap lake after around 115 km. Its waters' flow reverses direction every year, caused by greatly varying amounts of water carried by the Mekong over the course of a year and the impact of monsoonal rains, that coincides with the river's maximum.

The plains of the Mekong and Tonle Sap basin are confined in the North by the Dangrek and Central Annamite Mountains, and to the South by the Cardamom Mountains and Elephant Mountains. The plains completely surround the Tonle Sap Lake in the western half of the country and wind their way through the middle of the country following the course of the Mekong River. The two basins actually form a single body of water, the whole of which effects about 75% of Cambodia’s land cover.

Flow reversal
The Mekong river and its tributaries increase water volumes in spring (May) on the northern hemisphere, mainly caused by melting snows. As the Mekong enters Cambodia (over 95% of its waters have already joined the river) it widens and inundates large areas.

The plain's deepest point - the Tonle Sap - flooded area varies from a low of around 2700 km2 with a depth of around 1 meter at the end of the dry season (April) to 26000 km2 and a depth of up to 9 meters in October/November. This figure rose to 45000 km2 during 2000 when some of the worst flood conditions recorded caused over 800 deaths in Cambodia and Vietnam.

Inflow starts in May/June with maximum rates of flow of around 10,000 m3/s by late August and ends in October/November, amplified by precipitation of the annual monsoon. In November the lake reaches its maximum size. The annual monsoon coincides to cease around this time of the year. As the Mekong river begins its minimum around this time of the year and its water level falls deeper than the inundated Tonle Sap lake, Tonle Sap river and surrounding wetlands, waters of the lake's basin now drains via the Tonle Sap river into the Mekong.

As a result the Tonle Sap River (length around 115 km) flows 6 months a year from South-East (Mekong) to North-West (lake) and 6 month a year in the opposite direction. The mean annual reverse flow volume in the Tonle Sap is 30 km3, or about half of the maximum lake volume. A further 10% is estimated to enter the system by overland flow from the Mekong. The Mekong branches off into several arms near Phnom Penh and reaches Vietnamese territory south of Koh Thom and Loek Daek districts of Kandal Province.

Southern Mountains
This region represents the eastern parts of the original extent of the wet evergreen forests that cover the Cardamom - and Elephant Mountains in South-West Cambodia and along the mountains east of Bangkok in Thailand.

The densely wooded hills receive rainfall of 3000 to 5000 mm annually on their western slopes (which are subject to the South-West monsoons) but only 1020 to 1520 mm on their eastern - rain shadow - slopes.

The Cardamom/Krâvanh Mountains

Occupying Koh Kong Province and Kampong Speu Province, running in a north-western to south-eastern direction and rising to more than 1500 m. The highest mountain of Cambodia, Phnom Aural, at 1810 m is located in Aoral District in Kampong Speu Province. The Cardamom Mountains form - including the north-western part of Chanthaburi Province, Thailand, the 'Soi Dao Mountains' - the Cardamom Mountains Moist Forests Ecoregion, that is considered to be one of the most species-rich and intact natural habitats in the region. The climate, size inaccessibility and seclusion of the mountains have allowed a rich variety of wildlife to thrive. The Cardamom and Elephant Mountains remain to be fully researched and documented.

The Elephant Mountains

Chuŏr Phnum Dâmrei - A north-south-trending range of high hills, an extension of the Cardamom/Krâvanh Mountains, in south-eastern Cambodia, rising to elevations of between 500 and 1,000 meters. Extending 110 km north from the Gulf of Thailand, they reach a high point in the Bok Koŭ ridge at Mount Bokor 1081 m near the sea.

To the south-west of the Southern mountain ranges extends a narrow coastal plain that contains the Kampong Saom Bay area and the Sihanoukville peninsula, facing the Gulf of Thailand.

Northern Mountains
The Dangrek Mountains

A forested range of hills averaging 450 to 600 m, dividing Thailand from Cambodia, mainly formed of massive sandstone with slate and silt. A few characteristic basalt hills are located on the northern side of the mountain chain. This east–west-trending range extends from the Mekong River westward for approximately 320 km, merging with the highland area near San Kamphaeng, Thailand. Essentially the southern escarpment of the sandstone Khorat Plateau of northeastern Thailand, the Dângrêk range slopes gradually northward to the Mun River in Thailand but falls more abruptly in the south to the Cambodian plain. Its highest point is 761 m.

The watershed along the escarpment in general terms marks the boundary between Thailand and Cambodia, however there are exceptions. The region is covered in dry evergreen forest, mixed dipterocarp forest, and deciduous dipterocarp forests. Tree species like Pterocarpus macrocarpus, Shorea siamensis and Xylia xylocarpa var. kerrii dominate. Illegal logging are issues on both, the Thai as well as on the Cambodian side, leaving large hill stretches denuded, vulnerable tree species such as Dalbergia cochinchinensis have been affected. Forest fires are common during the dry season.

Annamite Range

Lying to the east of the Mekong River, the long chain of mountains called the Annamite Mountains of Indochina and the lowlands that surround them make up the Greater Annamites ecoregion. Levels of rainfall vary from 1500 to 3850 mm annually. Mean annual temperatures are about 20 C. This eco-region contains some of the last relatively intact moist forests in Indochina. Moisture-laden monsoon winds, that blow in from the Gulf of Tonkin ensure permanent high air humidity. Plants and animals adapted to moist conditions, to seek refuge here and evolve into highly specialized types that are found nowhere else on Earth.

Ethnically diverse More than 30 ethnic groups of indigenous people live in the Annamites, each with their distinctive and traditional music, language, dress and customs. The natural resources of the Greater Annamites are vital to all of these people.

Eastern Highlands
Tall grasses and deciduous forests cover the ground east of the Mekong River in Mondulkiri, where the transitional plains merge with the eastern highlands at altitudes from 200 to 1000 m. The landscape has suffered from rubber farming, logging and particularly mining, although sizable areas of pristine jungle survive, which are home to rare and endemic wildlife.

Coast
Cambodia's coastal area covers 17237 km2, distributed among four provinces: Sihanoukville province, Kampot province, Koh Kong province, and Kep province. The total length of the Cambodian coastal area has been disputed. The most widely accepted length is 440 km, a 1997 survey by the DANIDA organization announced a length at 435 km, and in 1973 the Oil Authority found the coast to be 450 km long. The Food and Agriculture Organization claims a length of 557 km in one of its studies.

The southern mountain ranges drain to the south and west towards the shallow sea. Sediments on the continental shelf are the basis for extensive mangroves marshes, in particular in the Koh Kong province and the Ream National Park.

Islands
Cambodia’s islands fall under administration of the 4 coastal provinces. "There are 60 islands in Cambodia's coastal waters. They include 23 in Koh Kong province, 2 in Kampot province, 22 in Sihanoukville and 13 in Kep city.[sic]" Most islands are, apart from the two small groups of the outer islands, in relative proximity to the coast. The islands and the coastal region of Koh Kong Province are mainly composed of upper Jurassic and lower Cretaceous sandstone massives. The north-westernmost islands near and around the Kaoh Pao river delta (Prek Kaoh Pao) area are to a great extent sediments of estuaries and rivers, very flat and engulfed in contiguous mangrove marshes.

Climate
Cambodia's climate, like that of much of the rest of mainland Southeast Asia is dominated by monsoons, which are known as tropical wet and dry because of the distinctly marked seasonal differences. The monsoonal air-flows are caused by annual alternating high pressure and low pressure over the Central Asian landmass. In summer, moisture-laden air—the southwest monsoon—is drawn landward from the Indian Ocean.

The flow is reversed during the winter, and the northeast monsoon sends back dry air. The southwest monsoon brings the rainy season from mid-May to mid-September or to early October, and the northeast monsoon flow of drier and cooler air lasts from early November to March. Temperatures are fairly uniform throughout the Tonlé Sap Basin area, with only small variations from the average annual mean of around 25 °C.

The maximum mean is about 30 °C ; the minimum mean, about 24 °C. Maximum temperatures of higher than 32 °C, however, are common and, just before the start of the rainy season, they may rise to more than 38 °C. Minimum night temperatures sporadically fall below 20 °C. in January, the coldest month. May is the warmest month - although strongly influenced by the beginning of the wet season, as the area constitutes the easternmost fringe of the south-west monsoon. Tropical cyclones only rarely cause damage in Cambodia.

The total annual rainfall average is between 1000 and 1500 mm, and the heaviest amounts fall in the southeast. Rainfall from April to September in the Tonlé Sap Basin-Mekong Lowlands area averages 1300 to 1500 mm annually, but the amount varies considerably from year to year. Rainfall around the basin increases with elevation. It is heaviest in the mountains along the coast in the southwest, which receive from 2500 mm to more than 5000 mm of precipitation annually as the southwest monsoon reaches the coast.

This area of greatest rainfall drains mostly to the sea; only a small quantity goes into the rivers flowing into the basin. Relative humidity is high throughout the entire year; usually exceeding 90%. During the dry season daytime humidity rates average around 50 percent or slightly lower, climbing to about 90% during the rainy season.

Hydrology
The Mekong River and its tributaries comprise one of the largest river systems in the world. The central Tonle Sap, the Great Lake has several input rivers, the most important being the Tonle Sap River, which contributes 62% of the total water supply during the rainy season. Direct rainfall on the lake and the other rivers in the sub-basin contribute the remaining 38%. Major rivers are the Sen river, Sreng River, Stung Pouthisat River, Sisophon River, Mongkol Borei River, and Sangkae River.

Smaller rivers in the southeast, the Cardamom Mountains and Elephant Range form separate drainage divides. To the east the rivers flow into the Tonle Sap, as in the south-west rivers flow into the Gulf of Thailand. Toward the southern slopes of the Elephant Mountains, small rivers flow south-eastward on the eastern side of the divide.

The Mekong River flows southward from the Cambodia-Laos border to a point south of Kratié (town), where it turns west for about 50 km and then turns southwest towards Phnom Penh. Extensive rapids run north of Kratie city. From Kampong Cham Province the gradient slopes very gently, and inundation of areas along the river occurs at flood stage. From June through November—through breaks in the natural levees that have built up along its course. At Phnom Penh four major water courses meet at a point called the Chattomukh (Four Faces). The Mekong River flows in from the northeast and the Tonle Sap river emanates from the Tonle Sap—flows in from the northwest. They divide into two parallel channels, the Mekong River proper and the Bassac River, and flow independently through the delta areas of Cambodia and Vietnam to the South China Sea.

The flow of water into the Tonle Sap is seasonal. In spring, the flow of the Mekong River, fed by monsoon rains, increases to a point where its outlets through the delta can't handle the enormous volume of water. At this point, the water pushes northward up the Tonle Sap river and empties into the Tonle Sap lake, thereby increasing the size of the lake from about 2590 km2 to about 24605 km2 at the height of the flooding. After the Mekong's waters crest — when its downstream channels can handle the volume of water — the flow reverses, and water flows out of the engorged lake.

As the level of the Tonle Sap retreats, it deposits a new layer of sediment. The annual flooding, combined with poor drainage immediately around the lake, transforms the surrounding area into marshlands, unusable for agricultural purposes during the dry season. The sediment deposited into the lake during the Mekong's flood stage appears to be greater than the quantity carried away later by the Tonle Sap River. Gradual silting of the lake would seem to be occurring; during low-water level, it is only about 1.5 m deep, while at flood stage it is between 10 and 15 m deep.

Vegetation & ecoregions
Cambodia has one of the highest levels of forest cover in the region as the interdependence of Cambodia’s geography and hydrology makes it rich in natural resources and biological diversity - among the bio-richest countries in Southeast Asia. The Royal Government of Cambodia estimates Cambodia contains approximately 10.36 million hectares of forest cover, representing approximately 57.07% of Cambodia’s land area (2011). On the contrary, international observers and independent sources provide rather different numbers. Consensus permeates, as most sources agree, that deforestation in Cambodia, loss of seasonal wetlands and habitat destruction - among countless minor factors - correlates with the absence of strict administrative control and indifference in law enforcement - not only in Cambodia but the entire region.

Figures and assessments are numerous as are available sources. as seen in numbers below, which provide a wide range for interpretation. About 69000 ha (1%) of forest cover is planted forest. Overall Cambodia’s forests contain an estimated 464 million metric tonnes of carbon stock in living forest biomass. Approximately 40% of Cambodia’s Forests have some level of protection, while one of the Cambodia Millennium Development Goals targets is to achieve a 60% forest cover by 2015.

According to the Forestry Administration statistics, a total of 380,000 hectares of forest were cleared between 2002 and 2005/2006 - a deforestation rate of 0.5% per year. The main cause of deforestation has been determined to be large-scale agricultural expansions.

Southern Annamites Montane Rain Forests ecoregion
The Southern Annamites Montane Rain Forests ecoregion of the montane forests of Kontuey Nea, "the dragon's tail" in the remote north-west of Cambodia, where the boundaries of Cambodia, Laos, and Vietnam meet [this is in the northeast, not the northwest?], is remarkably rich in biodiversity. The relatively intact forests occupy a broad topographic range - from lowlands with wet evergreen forests to montane habitats with evergreen hardwood and conifer forests. The complex geological, topographic and climatic ( rainfall and temperature ) facets that characterize the region make forest structure and composition unique and very variable. There is an unusually high number of near-endemic and endemic species among the many species to be found in the area. The entire eco-region has a size of 94000 km2.

The Great Lake ecosystem
The Tonle Sap, also known as the Great Lake in central Cambodia is the largest freshwater lake in Southeast Asia and one of the richest inland fishing grounds in the world. The Lake functions as a natural flood water reservoir for the Mekong system as a whole and therefore is an important source of water for the Mekong Delta during the dry season. The ecosystem has developed as a result of the Mekong’s seasonal flow fluctuations.

A belt of freshwater mangroves known as the "flooded forest" surrounds the lake. The floodplains in turn are surrounded by low hills, covered with evergreen seasonal tropical forest with substantial dipterocarp vegetation or deciduous dry forest. The eco-region consists of a mosaic of habitats for a great number of species. The forest gradually yields to bushes and finally grassland with increasing distance from the lake.

Henri Mouhot: "Travels in the Central Parts of Indo-China" 1864

On higher quality soils or at higher elevation, areas of mixed deciduous forest and semi-evergreen forests occur. This variety of vegetation types accounts for the quantity and diversity of species of the Great Lake ecosystem. Interlocking forest, - grassland and marshland patches provide the many facets and refugia for the abundant local wildlife.

The lake’s flooded forest and the surrounding floodplains are of utmost importance for Cambodia's agriculture as the region represents the cultural heart of Cambodia, the center of the national freshwater fishery industry - the nation's primary protein source. Threats to the lake include widespread pollution, stress through growth of the local population which is dependent on the lake for subsistence and livelihood, over-harvesting of fish and other aquatic - often endangered - species, habitat destruction and potential changes in the hydrology, such as the construction and operation of dams, that disrupt the lake's natural flood cycle. However, concerns that the lake is rapidly filling with sediment seem - according to studies - to be unfounded at the present time.

Wetlands
Wetlands cover more than 30% of Cambodia. In addition to the Mekong River and the Tonle Sap floodplain there are the Stung Sen River and the coastal Stung Koh Pao - and Stung Kep estuaries of Koh Kong Province and Kep Province. The freshwater wetlands of Cambodia represent one of the most diverse ecosystems worldwide. The area’s extensive wetland habitats are the product of the annual Mekong maximum, the simultaneous wet season and the drainage paths of a number of minor rivers. See also:Geography of Cambodia The numerous and varied wetlands are Cambodia's central and traditional settlement area, the productive environments for rice cultivation, freshwater fisheries, other forms of agriculture and aquaculture and the constantly growing tourism sector. Considering the eco-region's importance, a variety of plans for local wetland management consolidation exist with varying degrees of completion.

Coastal habitats

The Cambodian coastline consists of 60000 ha of over 30 species of mangroves - among the most biologically diverse wetlands on earth. The most pristine mangrove forests are found in Koh Kong Province. In addition to mangroves, sea-grass beds extend throughout the coastal areas, especially in Kampot Province, the Sihanoukville Bay Delta and the Kep municipal waters. The meadows are highly productive, but few animals feed directly on the grasses. Those that do tend to be vertebrates such as sea turtles, dabbling ducks and geese.

"With their roots deep in mud, jagged and gnarled mangrove trees are able to grow in the brackish wetlands between land and sea where other plant life cannot survive. The trees offer refuge and nursery grounds for fish, crabs, shrimp, and mollusks. They are nesting - and migratory sites for hundreds of bird species. They also provide homes for monkeys, lizards, sea turtles, and many other animals as well as countless insects."

"Until relatively recently, the mangroves of Koh Kong, Cambodia have remained relatively intact. This is partly because of the region’s location — it is an isolated, inaccessible place — and because decades of war and conflict perversely protected the forests from over-exploitation. Local people, however, tended to use the forest's sustainability, for food, fuel, medicine, building materials, and other basic needs."

Fauna

Cambodia is home to a wide array of wildlife. There are 212 mammal species, 536 bird species, 176 reptile species (including 89 subspecies), 850 freshwater fish species (Tonlé Sap Lake area), and 435 marine fish species. Many of the country's species are recognized by the IUCN or World Conservation Union as threatened, endangered, or critically endangered due to deforestation and habitat destruction, poaching, illegal wildlife trade, farming, fishing, and unauthorized forestry concessions. Intensive poaching may have already driven Cambodia's national animal, the Kouprey, to extinction. Wild tigers, Eld's deer, wild water buffaloes and hog deer are at critically low numbers.

Protected areas
"The 1993 Royal Decree on the Protection of Natural Areas recognized 23 protected areas, which at the time covered more than 18% of the country’s total land area."
 * Natural parks (sometimes described as ‘national parks’)
 * Wildlife reserves
 * Protected scenic view areas (sometimes described as ‘protected landscapes’)
 * Multi-purpose areas

Political and human geography
Cambodia borders Vietnam over a length of 1228 km, Thailand over a length of 803 km and Laos over a length of 541 km, with 2572 km in total and an additional 443 km of coastline. The capital (reach thani) and provinces (khaet) of Cambodia are first-level administrative divisions. Cambodia is divided into 25 provinces including the capital.

Municipalities and districts are the second-level administrative divisions of Cambodia. The provinces are subdivided into 159 districts and 26 municipalities. The districts and municipalities in turn are further divided into communes (khum) and quarters (sangkat).

Land use
Cambodia, Laos and Vietnam have experienced major changes in land use and land cover over the last two decades. The emergence from cold war rivalries and recent major economic reforms result in a shift from subsistence agrarian modes of production to market-based agricultural production and industrialized economies, which are heavily integrated into regional and global trade systems.

Regional divisions
Cambodia's boundaries were for the most part based upon those recognized by France and by neighboring countries during the colonial period. The 800 km boundary with Thailand runs along the watershed of the Dangrek Mountains, although only in its northern sector. The 541 km border with Laos and the 1228 km border with Vietnam result from French administrative decisions and do not follow major natural features. Border disputes have broken out in the past and do persist between Cambodia and Thailand as well as between Cambodia and Vietnam.

Area and boundaries

 * Area:
 * total: 181035 km2
 * country rank in the world: 88th
 * land: 176515 km2
 * water: 4520 km2

 * Area comparative:
 * Australia comparative: slightly less than $4⁄5$ the size of Victoria
 * Canada comaparative: slightly more than $2 1⁄2$ times the size of New Brunswick
 * United States comparative: approximately the size of Oklahoma
 * United Kingdom comparative: approximately $3⁄4$ the size of the United Kingdom
 * EU comparative: slightly less than twice the size of Portugal

 * Maritime claims:
 * territorial sea: 12 nmi
 * contiguous zone: 24 nmi
 * exclusive economic zone: 200 nmi
 * continental shelf: 200 nmi

 * Elevation extremes
 * lowest point: Gulf of Thailand 0 m
 * highest point: Phnum Aoral 1810 m

 * Border disputes
 * Cambodian–Thai border dispute
 * Cambodian–Vietnamese land dispute

 * Lakes
 * Tonlé Sap Lake
 * Yak Loum Crater Lake — Ratanakiri

Natural resources
In late 1969, the Cambodian government granted a permit to a French company to explore for petroleum in the Gulf of Thailand. By 1972 none had been located, and exploration ceased when the Khmer Republic (see Appendix B) fell in 1975. Subsequent oil and gas discoveries in the Gulf of Thailand and in the South China Sea, however, could spark renewed interest in Cambodia's offshore area, especially because the country is on the same continental shelf as its Southeast Asian oil-producing neighbors.
 * Oil and natural gas - In addition to the four parts of mining project, the oilfield, Block A was discovered in 2005 and located 200 km offshore in the gulf of Thailand Chevron would operate and hold a 30% interest Block A which cover 4079 km2. It is expected to get 30-year-production permit in the second quarter of 2011.
 * Timber
 * Dipterocarpus alatus (chheuteal tan) sawnwood, veneer, plywood
 * Anisoptera glabra (mersawa, phdiek) sawnwood, veneer, plywood
 * Hopea odorata (koki) Sawmilling, construction (bridges, boats)
 * Shorea vulgaris (choë(r) chông) sawmilling, construction (housing)
 * Heritiera javanica (synonym Tarrietia javanica) sawnwood (decorative, furniture)
 * Gemstones - Gemstone areas are located in Samlot district of Battambang, Paillin, Ratanakkiri, and Takéo Province
 * Iron ore - Hermatite (Fe2O3); Magnetite (Fe3O4); Limonite (2Fe2O3, 3H2O) - was found in two areas, one located in Phnom Deck and the others located in Koh Keo of Preah Vihear Province, and Thalaborivath of Stung Treng Province. According to General Department of Mineral, the total iron reserves in Phnom Deck area are estimated at 5 to 6 Million tons and other deposits may add 2 to 3 Million tons.
 * Gold - Gold deposit was found in four provinces: Kampong Cham (The Rumchek in Memot area), Kampong Thom (Phnom Chi area), Preah Vihear (Phnom Deck in Roveing district), Ratanakiri (Oyadav district) and Mondulkiri
 * Bauxite – was found in Battambang Province and Chhlong district in Mondulkiri Province.
 * Antimony (Sb) – found in Sre Peang area, Pursat Province
 * Chromium (Cr) – found in Sre Peang area, Pursat Province
 * manganese
 * phosphates
 * Hydro-power - Hydroelectric dams: Lower Se San 2 Dam, Stung Treng Dam
 * Arable land
 * Marine resources

Total renewable water resources:
 * 476.1 km3 (2011)

Freshwater withdrawal (domestic/industrial/agricultural):
 * Total: 2.18 km3/yr (4%/2%/94%)
 * Per capita: 159.8 km3/yr (2006)

Natural hazards

 * Monsoonal rains (June to November)
 * Mekong flooding
 * Occasional droughts

Human impact
Issues
 * Illegal logging activities throughout the country
 * rubber tree mono-cultures and strip mining for gold in the eastern highlands
 * gem mining in the western region along the border with Thailand
 * destruction of mangrove swamps threatens natural fisheries, illegal fishing and over-fishing
 * large scale sand mining in river beds and estuaries of Koh Kong's mangrove marshes affects tidal balance

A nascent environmental movement has been noticed by NGO's - and it is gaining strength, as the example of local resistance against the building of a Chinese hydro-electric dam in the Areng Valley shows.

Cambodia has a bad but improving performance in the global Environmental Performance Index (EPI) with an overall ranking of 146 out of 180 countries in 2016. This is among the worst in the Southeast Asian region, only ahead of Laos and Myanmar. The EPI was established in 2001 by the World Economic Forum as a global gauge to measure how well individual countries perform in implementing the United Nations' Sustainable Development Goals.

The environmental areas where Cambodia performs worst on the EPI (i.e. highest ranking) are air quality (148), water resource management (140) and health impacts of environmental issues (137), with the areas of sanitation, environmental impacts of fisheries and forest management following closely. Cambodia has an unusually large expanse of protected areas, both on land and at sea, with the land-based protections covering about 20% of the country. This secures Cambodia a better than average ranking of 61 in relation to biodiversity and habitat, despite the fact deforestation, illegal logging, construction and poaching are heavily deteriorating these protections and habitats in reality, partly fueled by the government's placement of economic land concessions and plantations within protected areas.

In November 2017, the U.S. cut funds to help clear unexploded ordnance including land mines and chemical weapons in Cambodia which it had dropped during the Vietnam War.

Consequences
 * Flooding
 * Deforestation
 * Soil erosion in rural areas
 * Declining fish stocks
 * Decreasing access to clean water
 * Habitat loss and declining biodiversity

International agreements and conventions
Cambodia is party to the following treaties:
 * Convention on Biological Diversity
 * Convention on Climate Change
 * MARPOL 73/78
 * Tropical Timber 94
 * Ramsar Convention on Wetlands

Signed, but not ratified:
 * Law of the Sea

National

 * Ministry of Land Management Urban Planning and Construction
 * Forestry Administration
 * Law on Forestry
 * law on land use
 * Ministry of Water Resources and Meteorology
 * Tonle Sap Authority
 * Economic Land Concession
 * Environmental Law
 * An Assessment of Cambodia’s Draft Environmental Impact Assessment Law
 * Climate Change Department

International

 * National Library of France
 * National Aquaculture Legislation
 * Cambodia Forestry Outlook Study
 * FAO UN
 * Mekong River Commission
 * National Adaptation Programme of Action to Climate Change (NAPA)
 * World reference base for soil resources

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Geography of Cambodia


text:
Demographics of Cambodia

Demographic features of the population of Cambodia include population density, ethnicity, education level, health of the populace, economic status, religious affiliations and other aspects of the population.

Population
Between 1874 and 1921, the total population of Cambodia increased from about 946,000 to 2.4 million. By 1950, it had increased to between 3,710,107 and 4,073,967, and in 1962 it had reached 5.7 million. From the 1960s until 1975, the population of Cambodia increased by about 2.2% yearly, the lowest increase in Southeast Asia.

By 1975 when the Khmer Rouge took power, the population was estimated at 7.3 million. Of this total an estimated one to two million reportedly died between 1975 and 1978. In 1981, the PRK gave the official population figure as nearly 6.7 million, although approximately 6.3 million to 6.4 million is probably more accurate.

The average annual rate of population growth from 1978 to 1985 was 2.3% (see table 2, Appendix A). A post-Khmer Rouge baby boom pushed the population above 10 million, although growth has slowed in recent years.

In 1959, about 45% of the population was under 15 years of age. By 1962, this had increased slightly to 46%. In 1962, an estimated 52% of the population was between 15 and 64 years of age, while 2% were older than 65. The percentage of males and females in the three groups was almost the same.

Fertility
The total fertility rate in Cambodia was 3.0 children per woman in 2010. The fertility rate was 4.0 children in 2000. Women in urban areas have 2.2 children on average, compared with 3.3 children per woman in rural areas. Fertility is highest in Mondol Kiri and Rattanak Kiri Provinces, where women have an average of 4.5 children, and lowest in Phnom Penh where women have an average of 2.0 children.

Fertility and Births
Total Fertility Rate (TFR) (Wanted Fertility Rate) and Crude Birth Rate (CBR):

Total fertility rate and other related statistics by province, as of 2014:

Infant and childhood mortality
Childhood mortality rates are decreasing in Cambodia. Currently, the infant mortality rate is 45 deaths per 1,000 live births for the five-year period before the survey compared with 66 deaths reported in the 2005 CDHS and 95 in the 2000 CDHS. Under-five mortality rates have also decreased from 124 deaths per 1,000 live births in 2000, 83 deaths in 2005 to 54 deaths per 1,000 in 2010.

Childhood mortality decreases markedly with mother's education and wealth. Infant mortality, for example, is twice as high among children whose mothers have no schooling compared to those with secondary or higher education (72 versus 31). The association with wealth is even stronger. There are 77 deaths per 1,000 live births among infants from the poorest households compared to only 23 deaths per 1,000 live births among infants from the richest households.

Mortality rates are much higher in rural than urban areas. Infant mortality, for example, is 64 deaths per 1,000 live births in rural areas compared to only 22 in urban areas. Mortality also differs by province. Infant mortality ranges from only 13 deaths per 1,000 live births in Phnom Penh to 78 deaths per 1,000 live births in Kampong Chhnang and Svay Rieng.

Life expectancy
In 1959, life expectancy at birth was 44.2 years for males and 43.3 years for females. By 1970, life expectancy had increased by about 2.5 years since 1945. The greater longevity for females apparently reflected improved health practices during maternity and childbirth.

Source: UN World Population Prospects

Ethnic groups

The largest of the ethnic groups in Cambodia are the Khmer, who comprise 95.8% of the total population and primarily inhabit the lowland Mekong sub region and the central plains.

The Khmer historically have lived near the lower Mekong River in a contiguous arc that runs from the southern Khorat Plateau where modern-day Thailand, Laos and Cambodia meet in the northeast, stretching southwest through the lands surrounding Tonle Sap lake to the Cardamom Mountains, then continues back southeast to the mouth of the Mekong River in southeastern Vietnam.

Ethnic groups in Cambodia other than the politically and socially dominant Khmer are classified as either "indigenous ethnic minorities" or "non-indigenous ethnic minorities". The indigenous ethnic minorities, more commonly collectively referred to as the Khmer Loeu ("upland Khmer"), constitute the majority in the remote mountainous provinces of Ratanakiri, Mondulkiri and Stung Treng and are present in substantial numbers in Kratie Province.

Approximately 17-21 separate ethnic groups, most of whom speak Austroasiatic languages related to Khmer, are included in the Khmer Loeu designation, including the Kuy and Tampuan people. These peoples are considered by the Khmer to be the aboriginal inhabitants of the land. Two of these highland groups, the Rade and the Jarai, are Chamic peoples who speak Austronesian languages descended from ancient Cham. These indigenous ethnic minorities haven't integrated into Khmer culture and follow their traditional animist beliefs.

The non-indigenous ethnic minorities include immigrants and their descendants who live among the Khmer and have adopted, at least nominally, Khmer culture and language. The three groups most often included are the Chinese Cambodians, Vietnamese and Cham peoples. The Chinese have immigrated to Cambodia from different regions of China throughout Cambodia's history, integrating into Cambodian society and today Chinese Cambodians or Cambodians of mixed Sino-Khmer ancestry dominate the business community, politics and the media. The Cham are descendants of refugees from the various wars of the historical kingdom of Champa. The Cham live amongst the Khmer in the central plains but in contrast to the Khmer who are Theravada Buddhists, the vast majority of Cham follow Islam.

There are also small numbers of other minority groups. Tai peoples in Cambodia include the Lao along the Mekong at the northeast border, Thai (urban and rural), and the culturally Burmese Kola, who have visibly influenced the culture of Pailin Province. Even smaller numbers of recent Hmong immigrants reside along the Lao border and various Burmese peoples have immigrated to the capital, Phnom Penh.

Languages

 * Official language

Khmer is an Austroasiatic language spoken by over 90% of the Cambodian population. The vast majority of Khmer speakers use the Central Khmer dialect. Central Khmer is the variety spoken in the central plain where the ethnic Khmers most heavily concentrate. Other Khmer dialects include the Phnom Penh variety, as well as Northern Khmer (Surin Khmer), Western Khmer (Cardamom Khmer), Southern Khmer (Khmer Krom), and the Khmer Khe dialect in Stung Treng province.

The Northern Khmer dialect is also spoken by over a million Khmers in the southern regions of Northeast Thailand. Western Khmer displays features of the Middle Khmer language, and is considered a conservative dialect. Southern Khmer is the first language of the Khmer Krom people in the Mekong Delta region in Vietnam.

According to Glottolog, 22 languages other than Khmer are spoken in Cambodia, most of which are also Austroasiatic languages. Other Austroasiatic languages of Cambodia include Kuy, Por (Pear), Somray, Chong, Suoy, Sa'och, Tampuan, Kaco', Stieng, Mnong, Brao, Krung (Rade), and Sou (Laven).
 * Minority languages:

Many of these languages are also spoken in Vietnam. Vietnamese itself is also spoken in parts of Cambodia. Non-Austroasiatic minority languages of Cambodia include Cham and Jarai (Austronesian) as well as Thai and Lao (Tai-Kadai).

English and French are used to different extents in education.
 * Languages of education
 * Sign language
 * Cambodian Sign Language

Religions

 * Buddhism: 97.1%, Islam: 2.0%, Christianity: 0.3%, Others: 0.5%

CIA World Factbook demographic statistics
The following demographic statistics are from the CIA World Factbook, unless otherwise indicated.

 * Note: estimates for this country take into account the effects of excess mortality due to AIDS; this can result in lower life expectancy, higher infant mortality, higher death rates, lower population growth rates, and changes in the distribution of population by age and sex than would otherwise be expected (July 2016 est.)

Population growth rate

 * 1.56% (2016 est.)
 * 1.698% (2011 est.)
 * 1.71% (2010 est.)
 * 1.77% (2009 est.)
 * 1.75% (2008 est.)

Sex ratio

 * At birth: 1.05 male(s)/female
 * 0-14 years: 1.02 male(s)/female
 * 15-24 years: 0.98 male(s)/female
 * 25-54 years: 0.96 male(s)/female
 * 55-64 years: 0.65 male(s)/female
 * 65 years and over: 0.6 male(s)/female
 * Total Population: 0.94 male(s)/female (2016 est.)

Life expectancy at birth

 * Total population: 64.5 years
 * Male: 62 years
 * Female: 67.1 years (2016 est.)

HIV/AIDS
Adult prevalence rate
 * 0.63% (2015 est.)

People living with HIV/AIDS
 * 74,100 (2015 est.)
 * 63,000 (2009 est.)
 * 75,000 (2007 est.)

Deaths
 * 1,000 (2011 est.)
 * 2,000 (2015 est.)
 * 3,100 (2009 est.)
 * 6,900 (2007 est.)

Nationality

 * Noun: Cambodian(s) or Khmer(s)
 * Adjective: Cambodian or Khmer

Urbanization

 * Urban population: 39.4% of total population (2019)
 * Rate of urbanization: 7.8% annual rate of change (2008—2019)

Literacy

 * Definition: age 15 and over can read and write

 * Total population: 88.5%
 * Male: 91.1%
 * Female: 86.2% (2019)

Education expenditure

 * 1.9% of GDP (2014)

Diaspora
Countries with notable populations of Cambodians are:
 * 🇹🇭 Thailand
 * Vietnam
 * 🇺🇸 United States
 * 🇫🇷 France
 * 🇲🇾 Malaysia
 * 🇦🇺 Australia
 * 🇨🇦 Canada
 * 🇳🇿 New Zealand
 * 🇨🇳 China
 * 🇭🇰 Hong Kong
 * UK
 * Laos
 * 🇸🇬 Singapore
 * 🇨🇭 Switzerland
 * 🇰🇷 South Korea

title: Demographics of Cambodia