Cambodia, officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia. With a total landmass of 181,035 square kilometres (69,898 sq mi), it is 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 68th 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 various hill tribes. The capital and largest city is Phnom Penh; the political, economic, and cultural center of Cambodia. The kingdom is a constitutional monarchy with Norodom Sihamoni, a monarch chosen by the Royal Throne Council, as head of state.