Cambodia

• 1. Introduction

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  Cambodia sits at a crossroads where ancient empire and modern catastrophe meet, a country of 17 million people whose story spans from one of the largest cities ever built to one of history's most devastating genocides. The Tonle Sap, Southeast Asia's largest lake, swells to nearly ten times its dry-season size each year, flooding the heartland that has fed Khmer civilization for millennia. In 802 AD, Jayavarman II united the warring princes of Chenla under the name Kambuja, planting the seed of an empire that would one day rule the largest pre-industrial city on earth. How did that empire rise, fall, and leave a nation still grappling with its aftermath? What made Cambodia a target for powers ranging from ancient Java to Cold War America to the Khmer Rouge? And how do a people who lost somewhere between one and three million of their own in four years rebuild a country from the ground up? These are the questions Cambodia's story forces us to ask.

• 2. Before the Empire

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  The cave of Laang Spean holds Cambodia's oldest confirmed human presence. Excavations in its lower layers produced radiocarbon dates around 6000 BC, placing hunter-gatherers in the region during the Holocene. Upper layers in the same cave revealed a transition to Neolithic life, with the earliest dated earthenware ceramics found anywhere in Cambodia.

  Rice farming arrived from the north beginning in the third millennium BC. The clearest prehistoric signature of this shift is a scattering of circular earthworks discovered in the red soils near Memot in the latter 1950s, some of which possibly date from the second millennium BC. Their function is still debated. By about 500 BC, communities in the region were working iron, with supporting evidence coming from the Khorat Plateau in what is now Thailand.

  Glass beads recovered from sites like Phum Snay in the northwest and Prohear in the southeast point to two distinct trading networks operating at different times. A shift from one network to the other occurred around the 2nd to 4th century AD, probably driven by changes in political power. By the 3rd, 4th, and 5th centuries, the Indianised states of Funan and its successor Chenla had taken shape across what is now Cambodia and southwestern Vietnam, absorbing influences from India and passing them on to the cultures that would later become Thailand and Laos.

• 3. The Khmer Empire

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  Jayavarman II declared independence from Java in 802 and proclaimed himself a Devaraja, a god-king, founding an institution that would define Khmer political identity for centuries. The cult of the god-king drove a program of conquest and construction that the empire sustained from the 9th to the 15th century. During the 12th century the Khmer Empire was Southeast Asia's largest empire, and its capital Angkor grew into something unprecedented. In 2007 an international research team using satellite photographs concluded that Angkor had been the largest pre-industrial city in the world, with an urban sprawl of 2,980 km2 and a population that may have reached one million people.

  The empire did not develop in isolation. Theravada missionaries from Sri Lanka reintroduced their branch of Buddhism to Southeast Asia around the 13th century, having sent earlier missions in the 1190s. The religion displaced both Hinduism and Mahayana Buddhism as the faith of Angkor, though it did not become the official state religion until 1295, when Indravarman III took power. During the reign of Jayavarman VIII, the Mongol army of Kublai Khan attacked; the king managed to buy peace rather than fight.

  Angkor was sacked by the Ayutthaya Kingdom and abandoned in 1432, the result of ecological failure and the breakdown of its infrastructure. The capital moved to Longvek, which thrived as part of the 16th century Asian maritime trade network, until the Siamese conquest of Longvek in 1594 dealt another blow. Through the 17th and 18th centuries, both Siam and Vietnam pressed in from either side, alternately demanding tribute and steadily eroding Khmer sovereignty. The Mekong Delta, once part of the Khmer Empire, passed to Vietnamese control in 1698. Hill tribe peoples during this era were, in the words of one contemporary account, hunted and carried off as slaves by Siamese, Vietnamese, and Cambodian actors alike.

• 4. French Rule and the Road to Independence

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  In 1863, King Norodom signed a treaty of protection with France, beginning a protectorate that would last, with interruptions, until 1953. One of those interruptions was Japanese occupation from 1941 to 1945, during which Cambodia simultaneously existed as the puppet state known as the Kingdom of Kampuchea. Between 1874 and 1962, Cambodia's total population grew from about 946,000 to 5.7 million.

  France shaped succession at the top in ways that would reverberate for generations. After King Norodom died in 1904, France placed his brother Sisowath on the throne rather than Norodom's own line. When Sisowath's son Monivong died in 1941, France again passed over the obvious heir, Monivong's son Monireth, judging him too independently minded. Instead they enthroned Norodom Sihanouk, a maternal grandson of Sisowath. The French expected the young Sihanouk to be easy to control.

  That calculation proved wrong. Cambodia gained independence from France on the 9th of November 1953 under King Norodom Sihanouk. Two years later, in 1955, Sihanouk abdicated in favour of his father so he could enter politics directly, and was elected Prime Minister. When his father died in 1960, Sihanouk returned as head of state with the title of prince. His first official census, conducted by the French protectorate in 1921, had counted only men aged 20 to 60, since its purpose was tax collection. The gap between that instrument and any modern conception of governance captures something essential about what independence required Cambodia to build from scratch.

• 5. War, Genocide, and the Killing Fields

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  Sihanouk navigated Cold War pressures with a declared policy of neutrality, even as he privately told Washington Post journalist Stanley Karnow in December 1967 that he would not object if the United States bombed Vietnamese communist sanctuaries inside Cambodia, so long as no Cambodians were killed. The same message reached U.S. President Lyndon B. Johnson through emissary Chester Bowles in January 1968. Publicly, Sihanouk opposed the strikes. The bombing continued regardless.

  While Sihanouk was visiting Beijing in 1970, a military coup led by Prime Minister General Lon Nol and Prince Sisowath Sirik Matak removed him. Documents uncovered from Soviet archives after 1991 revealed that the North Vietnamese attempt to overrun Cambodia in 1970 was launched at the explicit request of the Khmer Rouge, negotiated by then second-in-command Nuon Chea. On New Year's Day 1975, communist troops launched an offensive that brought down the Khmer Republic in 117 days. The Lon Nol government surrendered on the 17th of April 1975, five days after the U.S. mission evacuated.

  What followed was among the 20th century's worst catastrophes. Estimates of the people killed by the Khmer Rouge regime range from approximately one to three million; a commonly cited figure is two million, about a quarter of the population. The prison Tuol Sleng became synonymous with mass killing, and the phrase Killing Fields entered the global vocabulary. The Cham Muslims were targeted with particular ferocity, with as much as half their population exterminated. Professionals were singled out: doctors, lawyers, teachers. Robert D. Kaplan noted that eyeglasses were as deadly as the yellow star, treated as evidence of intellectualism. By 1978, the entire legal system had been eradicated; only 6 to 12 legal professionals survived and remained in the country. The regime also destroyed 95% of Cambodia's Buddhist temples.

  In November 1978, Vietnamese troops invaded in response to Khmer Rouge border raids and conquered the country. A coalition government-in-exile called the Coalition Government of Democratic Kampuchea was formed in 1981, recognized by the United Nations, and included the Khmer Rouge alongside royalist and other factions. Peace efforts that began in Paris in 1989 culminated in the Paris Comprehensive Peace Settlement of October 1991.

• 6. Power, Politics, and One-Party Rule

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  The 1993 elections, organized by the United Nations Transitional Authority in Cambodia, restored the monarchy with Norodom Sihanouk as king. FUNCINPEC, led by Sihanouk's son Ranariddh, won a hung parliament. A power-sharing agreement made both Ranariddh and Hun Sen of the Cambodian People's Party co-Prime Ministers simultaneously, after the CPP threatened to secede part of the country if power was fully transferred.

  Hun Sen, a former Khmer Rouge commander who had been installed by the Vietnamese, moved to consolidate control in 1997. Fearing the growing influence of Ranariddh, he launched a coup using the army. Ranariddh fled to Paris; opponents were arrested, tortured, and some summarily executed. Cambodia was admitted to the Association of Southeast Asian Nations on the 30th of April 1999, and in 2004 Norodom Sihamoni was crowned king after his father Sihanouk abdicated.

• 7. The Tonle Sap and the Land

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  Cambodia covers 181,035 km2 and lies entirely within the tropics. The country's most distinctive geographical feature is the Tonle Sap, which measures about 2,590 km2 during the dry season and expands to roughly 24,605 km2 during the rainy season. The reversal of the Tonle Sap River, which flows back into the lake as the Mekong floods, is the engine behind this cycle, and the wet rice cultivation it enables is the heartland of Cambodian agriculture.

  The lake sustains a biodiversity that few freshwater systems on earth can match. Scientists have recorded 850 freshwater fish species in the Tonle Sap Lake area alone. The Tonle Sap Biosphere Reserve, nominated as a UNESCO Biosphere Reserve in 1997, encompasses the lake and nine provinces. Cambodia also supports 212 mammal species, 536 bird species, and 240 reptile species across its territory.

  Deforestation threatens this ecological wealth directly. Cambodia's primary forest cover fell from over 70% in 1969 to just 3.1% in 2007. By 2020, total forest cover stood at roughly 46% of the land area, equivalent to around 8,068,370 hectares, down from 11,004,790 hectares in 1990. The annual rate of deforestation between 2010 and 2015 ran at 1.3%. Hydroelectric development plans upstream on the Mekong, particularly by Laos, pose what Gordon Holtgrieve, a professor at the University of Washington, described as a real danger to the food supply of both Vietnam and Cambodia. He noted that none of the dams built or under construction on the Mekong are pointing at good outcomes for the fisheries that provide the vast majority of Cambodia's protein.

• 8. Society and What Remains

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  Unexploded land mines have been responsible for over 60,000 civilian deaths and thousands more injuries since 1970. Between 1979 and 2013, landmines and unexploded ordnance caused 44,630 injuries recorded by the Cambodia Mine/UXO Victim Information System. One in every 290 Cambodians is an amputee. Cambodia is expected to be free of land mines by 2025.

  The population is 95.8% ethnic Khmer, with Cham Muslims at 1.8%, Chinese at 0.6%, and Vietnamese at 0.5%. Half the population was younger than 22 years old as of 2010, a demographic scar left by the mass deaths of the 1970s. Life expectancy reached 75 years in 2021, up from 55 in 1995. Infant mortality dropped from 86 per 1,000 live births in 1998 to 24 in 2018.

  The garment industry accounts for 80% of Cambodia's exports. Tourism is the second-greatest source of hard currency, with international arrivals in 2023 topping 5.4 million. Tourism employs 26% of the workforce, roughly 2.5 million people. Cambodia's casinos grew from 57 in 2014 to 150 by 2018.

  Since the early 2020s, Cambodia has become a base for large-scale online scam operations linked to forced labour and trafficking. A 2023 UN human-rights report estimated that around 100,000 people were held in such operations. A 2025 Amnesty International report identified at least 53 scam compounds. In October 2025, the U.S. Department of Justice filed what it called the largest forfeiture action in its history, seeking forfeiture of approximately 127,271 bitcoin tied to alleged forced-labour scam compounds; one director of a company at the centre of the case is Hun To, nephew of Hun Sen and cousin of Hun Manet.