a country in SE Asia: became part of French Indochina in 1887; achieved self-government in 1949 and independence in 1953; civil war (1970–74) ended in victory for the Khmer Rouge, who renamed the country Kampuchea (1975) and carried out extreme-radical political and economic reforms resulting in a considerable reduction of the population; Vietnamese forces ousted the Khmer Rouge in 1979 and set up a pro-Vietnamese government who reverted (1981) to the name Cambodia; after Vietnamese withdrawal in 1989 a peace settlement with exiled factions was followed in 1993 by the adoption of a democratic monarchist constitution restoring Prince Sihanouk to the throne. The country contains the central plains of the Mekong River and the Cardamom Mountains in the SW. Official language: Khmer. Religion: Buddhist majority. Currency: riel. Capital: Phnom Penh. Pop: 16 005 373 (2017 est). Area: 181 000 sq km (69 895 sqmiles)