Cambodia, officially the Kingdom of Cambodia, is a country in Southeast Asia on the Indochinese Peninsula. It is bordered by Thailand to the northwest, Laos to the north, Vietnam to the east, and has a coastline along the Gulf of Thailand in the southwest. It spans an area of 181,035 square kilometres, and has a population of about 17 million. Its capital and most populous city is Phnom Penh, followed by Siem Reap and Battambang.