Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia. Its total landmass is 181,035 square kilometres (69,898 sq mi), bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, and the Gulf of Thailand to the southwest.

With a population of over 14.8 million, Cambodia is the 69th most populous country in the world. The official religion is Theravada Buddhism, which is practiced by approximately 95% of the Cambodian population. The country's minority groups include Vietnamese, Chinese, Chams, and 30 hill tribes. The capital and largest city is Phnom Penh, the political, economic, and cultural center of Cambodia.

Cambodia has had one of the best economic records in Asia, with economic growth averaging 6 percent for the last 10 years. Strong textiles, agriculture, construction, garments, and tourism sectors led to foreign investments and international trade.Oil and natural gas deposits found beneath Cambodia's territorial waters in 2005 remain mostly untapped, due in part to territorial disputes with Thailand.However, Cambodia is one of the poorest countries in the world with two million people living in poverty, endemic government corruption and a poor record on human rights. One third of the population live on less than a dollar a day. Forty per cent of children are chronically malnourished.Among the ten ASEAN countries, Cambodia ranked last in terms of quality of life in ASEAN

Geography
Cambodia has an area of 181,035 square kilometers (69,898 sq mi) and lies entirely within the tropics, between latitudes 10° and 15°N, and longitudes 102° and 108°E. It borders Thailand to the north and west, Laos to the northeast, and Vietnam to the east and southeast. It has a 443-kilometer (275 mi) coastline along the Gulf of Thailand.

Cambodia's landscape is characterized by a low-lying central plain that is surrounded by uplands and low mountains and includes the Tonle Sap (Great Lake) and the upper reaches of the Mekong River delta. Extending outward from this central region are transitional plains, thinly forested and rising to elevations of about 650 feet (200 meters) above sea level. To the north the Cambodian plain abuts a sandstone escarpment, which forms a southward-facing cliff stretching more than 200 miles (320 km) from west to east and rising abruptly above the plain to heights of 600 to 1,800 feet (180 to 550 meters). This cliff marks the southern limit of the Dângrêk Mountains.

Flowing south through the country's eastern regions is the Mekong River. East of the Mekong the transitional plains gradually merge with the eastern highlands, a region of forested mountains and high plateaus that extend into Laos and Vietnam. In southwestern Cambodia two distinct upland blocks, the Krâvanh Mountains and the Dâmrei Mountains, form another highland region that covers much of the land area between the Tonle Sap and the Gulf of Thailand. In this remote and largely uninhabited area, Phnom Aural, Cambodia's highest peak, rises to an elevation of 5,949 feet (1,813 meters). The southern coastal region adjoining the Gulf of Thailand is a narrow lowland strip, heavily wooded and sparsely populated, which is isolated from the central plain by the southwestern highlands.

The most distinctive geographical feature is the inundations of the Tonle Sap (Great Lake), measuring about 2,590 square kilometers (1,000 sq mi) during the dry season and expanding to about 24,605 square kilometers (9,500 sq mi) during the rainy season. This densely populated plain, which is devoted to wet rice cultivation, is the heartland of Cambodia. Much of this area has been designated as a biosphere reserve.

Climate
Cambodia's climate, like that of the rest of Southeast Asia, is dominated by monsoons, which are known as tropical wet and dry because of the distinctly marked seasonal differences.

Cambodia has a temperature range from 21 to 35 °C (69.8 to 95.0 °F) and experiences tropical monsoons. Southwest monsoons blow inland bringing moisture-laden winds from the Gulf of Thailand and Indian Ocean from May to October. The northeast monsoon ushers in the dry season, which lasts from November to April. The country experiences the heaviest precipitation from September to October with the driest period occurring from January to February.

Cambodia has two distinct seasons. The rainy season, which runs from May to October, can see temperatures drop to 22 °C (71.6 °F) and is generally accompanied with high humidity. The dry season lasts from November to April when temperatures can rise up to 40 °C (104 °F) around April. Disastrous flooding occurred in 2001 and again in 2002, with some degree of flooding almost every year.

Ecology
Cambodia has a wide variety of plants and animals. There are 212 mammal species, 536 bird species, 240 reptile species, 850 freshwater fish species (Tonle Sap Lake area), and 435 marine fish species. Much of this biodiversity is contained around the Tonle Sap Lake and the surrounding biosphere. The Tonle Sap Biosphere Reserve s a unique ecological phenomenon surrounding the Tonle Sap. It encompasses the lake and nine provinces: Kampong Thom, Siem Reap, Battambang, Pursat, Kampong Chhnang, Banteay Meanchey, Pailin, Oddar Meanchey and Preah Vihear. In 1997, it was successfully nominated as a UNESCO Biosphere Reserve. Other key habitats include the dry forest of Mondolkiri and Ratanakiri provinces and the Cardamom Mountains ecosystem, including Bokor National Park, Botum-Sakor National Park, and the Phnom Aural and Phnom Samkos wildlife sanctuaries.

The Worldwide Fund for Nature recognizes six distinct terrestrial ecoregions in Cambodia – the Cardamom Mountains rain forests, Central Indochina dry forest, Southeast Indochina dry evergreen forest, Southern Annamites montane rain forest, Tonle Sap freshwater swamp forest, and Tonle Sap-Mekong peat swamp forest.

The rate of deforestation in Cambodia is one of the highest in the world. Cambodia's primary forest cover fell from over 70% in 1969 to just 3.1% in 2007. In total, Cambodia lost 25,000 square kilometres (9,700 sq mi) of forest between 1990 and 2005—3,340 km2 (1,290 sq mi) of which was primary forest. Since 2007, less than 3,220 km2 (1,243 sq mi) of primary forest remain with the result that the future sustainability of the forest reserves of Cambodia is under severe threat, with illegal loggers looking to generate revenue.