Tanzania, officially the United Republic of Tanzania (Swahili: Jamhuri ya Muungano wa Tanzania), is a country in East Africa within the African Great Lakes region. It is bordered by Kenya and Uganda to the north; Rwanda, Burundi, and the Democratic Republic of the Congo to the west; Zambia, Malawi, and Mozambique to the south; and the Indian Ocean to the east. Kilimanjaro, Africa's highest mountain, is in northeastern Tanzania. Tanzania's population of 51.82 million (2014) is diverse, composed of several ethnic, linguistic, and religious groups. Tanzania is a presidential constitutional republic, and since 1996, its official capital city has been Dodoma, where the President's Office, the National Assembly, and some government ministries are located. Dar es Salaam, the former capital, retains most government offices and is the country's largest city, principal port, and leading commercial centre.