Vietnam,[d][e] officially the Socialist Republic of Viet Nam (SRV),[f][g] is a country at the eastern edge of Mainland Southeast Asia. With an area of about 331,000 square kilometres and a population of over 102 million, it is the world's 16th-most populous country. One of two communist states in Southeast Asia,[h] Vietnam is bordered by China to the north, and Laos and Cambodia to the west; it lies along the Gulf of Thailand to the southwest and the South China Sea to the east, where it has shared and disputed maritime borders with other countries. Its capital is Hanoi, while its most populous municipality is Ho Chi Minh City. Vietnam is a developing country with a lower-middle–income economy.[12] It has corruption, censorship, environmental issues, and a criticized human rights record. Vietnam is part of international and intergovernmental institutions, including the ASEAN, the APEC, the Non-Aligned Movement, the OIF, and the WTO. It has assumed a seat on the United Nations Security Council twice.