The Kingdom of Cambodia is a constitutional monarchy in Southeast Asia with a population of over 13 million people, most of whom are Theravada Buddhists of Khmer origin. A citizen of Cambodia is usually identified as Khmer or Cambodian.The country is bordered to the west by Thailand, to the north by Laos, to the east by Vietnam and to the south by the Gulf of Thailand. Its geography is dominated by the Mekong river and the Tonle Sap, a lake whose fish account for 60% of the nations protein intake. The capital is Phnom Penh. There are three main political parties, of which the Cambodian Peoples Party is the current ruling party.