Cambodia, officially the Kingdom of Cambodia, covers 181,035 square kilometres in mainland Southeast Asia, between Thailand to the west and northwest, Laos to the north, Vietnam to the east and southeast, and the Gulf of Thailand to the southwest. Its roughly 440-kilometre coast, divided among four coastal provinces, opens onto the eastern Gulf, while most of the interior belongs to the low-lying Mekong–Tonlé Sap system. Phnom Penh stands in the south-central plain where the Mekong, Tonlé Sap and Bassac waterways meet. The broad central basin is ringed by the Cardamom Mountains in the southwest, the Elephant Mountains nearer the coast, the Dângrêk escarpment along much of the northern frontier, and plateaus toward Laos and Vietnam. Phnom Aural, in the Cardamoms, rises to about 1,810 metres and is the country’s highest point. This bowl-like relief funnels water, sediment, farming and settlement toward the central lowlands, making hydrology unusually important to Cambodia’s geography.
Cambodia’s climate is governed chiefly by the tropical monsoon, but rainfall varies sharply with relief and distance from the Gulf of Thailand. The southwest monsoon normally brings the main rains from about May to October; the northeast monsoon dominates the drier months from roughly November to April, with the hottest conditions usually late in the dry season. The central plain receives less rain than the windward Cardamom and Elephant Mountains, where moist Gulf air is forced upward. Seasonal flooding is therefore not simply a hazard: the Mekong’s annual rise reverses the Tonlé Sap River, expanding the lake and inundating floodplain forests that support fisheries and agriculture. Climate change is making that cycle harder to manage. World Bank assessments identify rising exposure to floods, droughts and extreme heat, especially around the Mekong and Tonlé Sap, while coastal communities face sea-level rise and rural roads remain highly vulnerable to monsoon damage.
These water regimes sustain ecosystems ranging from evergreen and semi-evergreen forest in the southwest and northeast to dry deciduous forest, savanna, Mekong riverine habitat, Tonlé Sap wetlands, mangroves, seagrass beds and nearshore coral systems. The Tonlé Sap Biosphere Reserve protects a flood-pulse ecosystem important for fish breeding, migratory birds and communities dependent on the lake. Inland fisheries remain central to food security, while rice dominates cultivated lowlands; cassava, maize, rubber, cashews and fruit crops are important in drier or better-drained zones. Forest loss has nevertheless altered the national landscape. FAO’s 2020 Global Forest Resources Assessment recorded about 8.1 million hectares of forest in Cambodia, substantially below the area reported for 1990, although estimates differ with classification methods. Agricultural expansion, infrastructure, timber extraction and land conversion have fragmented habitats, while changing river flows, sediment loads and fishing pressure add stress to Tonlé Sap and Mekong ecosystems.
Human occupation of the lower Mekong region long predates written history, and sites such as Angkor Borei indicate complex settlements before the states known from Chinese records. From roughly the first to sixth centuries CE, polities conventionally called Funan participated in maritime and river trade linking mainland Southeast Asia with India and China; Hinduism, Buddhism and Sanskrit-derived political ideas entered through these networks without erasing local institutions. Funan was followed by polities grouped under the name Chenla, whose political geography was more fragmented than older dynastic narratives suggested. A decisive Angkorian phase began in the early ninth century: an inscription associates Jayavarman II with a declaration of sovereignty in 802, conventionally used to mark the Khmer Empire’s beginning. From Angkor, rulers built reservoirs, canals, roads and monumental Hindu and Buddhist temples while drawing on rice-producing plains. Angkor’s dominance weakened from the fourteenth and fifteenth centuries through a debated combination of warfare, hydraulic and environmental stress, and changing trade routes. Political centres shifted south toward the Mekong, Theravada Buddhism became increasingly central, and later courts at Longvek and Oudong faced growing pressure from Siam and Vietnam as European contact expanded.
That pressure helped shape the transition to the modern state. King Norodom accepted French protection in 1863, and Cambodia entered French Indochina in 1887; colonial rule reduced royal autonomy, reorganized administration and fixed much of the territorial framework inherited at independence. Cambodia achieved full independence on 9 November 1953. The new state initially pursued neutrality, but the wider Indochina war increasingly penetrated its territory. A 1970 coup replaced the monarchy with the Khmer Republic, followed by civil war; the Khmer Rouge captured Phnom Penh in April 1975 and imposed Democratic Kampuchea, whose evacuations, executions, hunger, disease and forced labour killed well over a million people. Vietnamese forces overthrew that regime in January 1979, but warfare continued through the 1980s. The Paris Peace Agreements of 23 October 1991 created a settlement framework and led to the United Nations Transitional Authority in Cambodia, elections in 1993 and restoration of a constitutional monarchy. Khmer Rouge resistance faded by the late 1990s, while subsequent decades brought political stability and rapid growth alongside an increasingly concentrated political system.
Economic development since the late 1990s has been tied to export manufacturing, foreign investment, construction, tourism and movement from agriculture into wage employment. Garments, footwear and travel goods remain major exports, while bicycles, electrical components and other light-industry products have broadened manufacturing; rice, cassava, rubber and cashews connect rural producers to external markets. The United States is Cambodia’s largest export destination, while China is the leading source of imports and a major investor; ASEAN and the European Union are also important. World Bank data show growth averaged 8.2% a year from 2000 to 2019, but the post-pandemic pattern is less even. IMF staff estimated real GDP growth at 6.0% in 2024 and 5.3% in 2025, then projected 3.0% for 2026; the World Bank’s June 2026 forecast was 3.9%, reflecting different assumptions amid fast-changing conditions. Strong exports and US$5.1 billion of foreign direct investment in 2025 contrast with weak real estate and domestic demand, financial-sector risks and a large informal economy. The riel is the official currency, although the economy remains highly dollarized.
Cambodia’s 2019 General Population Census recorded 15,552,211 people; the IMF’s 2026 country data place the population at about 18.05 million. Settlement remains concentrated in the Mekong and Tonlé Sap lowlands, where fertile soils, roads and market access support dense rural communities and the principal urban corridor. Phnom Penh is by far the largest city and the administrative, industrial and service centre; Siem Reap, Battambang and Sihanoukville are major secondary centres, while the northeastern uplands and Cardamom region remain sparsely populated. The 2019 census classified 39.4% of residents as urban, but comparison with earlier censuses requires caution because about one-fifth of enumeration areas previously treated as rural were reclassified as urban. Administratively, Cambodia consists of Phnom Penh capital and 24 provinces, subdivided into municipalities, districts or khans, then communes or sangkats and villages. Most citizens are Khmer, alongside Cham, Vietnamese, Chinese and numerous Indigenous highland communities whose identities are regionally and historically distinct.
Khmer is the official language and principal language of public life; 95.8% of the population reported it as a mother tongue in the 2019 census. Cham, Vietnamese, Chinese languages and Indigenous languages such as Bunong, Tampuan, Jarai and Kreung form smaller but locally important linguistic geographies, while English is widely used in business, higher education and international work. The same census recorded 97.1% of residents as Buddhist, overwhelmingly Theravada, with Islam at 2.0% and Christianity at 0.3%; many Cham communities are Muslim, while some Indigenous communities maintain distinct ritual traditions. Culture reflects the long interaction of court, monastery, village and regional exchange. Angkorian architecture and inscriptional traditions remain foundational, but the Royal Ballet, pinpeat music, chapei dang veng performance, shadow theatre, weaving and modern literature are living forms rather than museum survivals. Because the Khmer Rouge destroyed artists and institutions as well as lives, rebuilding cultural transmission after 1979 became part of national reconstruction.
Transport follows the lowland geography that has shaped settlement and trade. National Roads 1 and 5 connect toward Vietnam and Thailand, while National Road 4 and the Phnom Penh–Sihanoukville Expressway link the capital to the Gulf coast. Ministry figures reported about 20,308 kilometres of national and provincial roads in 2024, yet quality is uneven; World Bank assessments indicate more than 90% of rural roads are unpaved, leaving many communities exposed to access disruptions. The railway has two main lines, from Phnom Penh toward Poipet and to Sihanoukville, totaling about 650 kilometres after rehabilitation. Sihanoukville Autonomous Port is Cambodia’s sole international commercial deep-sea port, while Phnom Penh handles river cargo on the Mekong system. Techo International Airport became the capital’s main airport in September 2025, complementing Siem Reap-Angkor International Airport. Electricity comes from hydropower, coal, rapidly expanded solar generation and cross-border imports, but grid quality, transport resilience and service provision remain less consistent outside major urban and industrial corridors.
Cambodia’s regional importance derives less from size than from its position across the lower Mekong basin between the Thai and Vietnamese markets. It joined ASEAN in 1999 and the World Trade Organization in 2004, and it cooperates with Laos, Thailand and Vietnam through the Mekong River Commission, making cross-border water management inseparable from food, energy and environmental policy. New road, rail, port and industrial links are drawing Phnom Penh and Sihanoukville more deeply into Asian production networks, while employment remains exposed to demand in the United States, China, Europe and ASEAN. The development opportunity is to move from labour-intensive assembly and commodity exports toward higher-productivity manufacturing, agro-processing, logistics and cleaner energy. Constraints include skills gaps, informal employment, financial risks, rural infrastructure deficits, ecosystem degradation, and rising heat, drought and flood exposure. Cambodia’s regional weight will therefore depend on whether deeper integration is matched by stronger productivity, environmental resilience and institutions able to manage rapid economic change.
