The Republic of Zambia (IPA: [ˈzæmbɪə]), is a landlocked country in Southern Africa. The neighbouring countries are the Democratic Republic of the Congo to the north, Tanzania to the north-east, Malawi to the east, Mozambique, Zimbabwe, Botswana, and Namibia to the south, and Angola to the west. The capital city is Lusaka, located in the southeast of the country. The population is concentrated mainly around the capital and the Copperbelt to the northwest. Zambia has been inhabited for thousands of years by hunter-gatherers and migrating tribes. After sporadic visits by European explorers starting in the 18th century, Zambia was gradually claimed and occupied by the British as protectorate of Northern Rhodesia towards the end of the nineteenth century. On 24 October 1964, the protectorate gained independence with the new name of Zambia, derived from the Zambezi river which flows through the country. After independence the country moved towards a system of one party rule with Kenneth Kaunda as president. Kaunda dominated Zambian politics until multiparty elections were held in 1991. Zambia is a landlocked country in southern Africa, with a tropical climate and consists mostly of high plateau, with some hills and mountains, dissected by river valleys. At 752,614 km² (290,566 sq. mi.) it is the 39th-largest country in the world (after Chile) and slightly larger than the US state of Texas. Zambia is drained by two major river basins: the Zambezi basin in the south covering about three-quarters of the country; and the Congo basin in the north covering about one-quarter of the country. A very small area in the north-west forms part of the internal drainage basin of Lake Rukwa in Tanzania. In the Zambezi basin, there are a number of major rivers flowing wholly or partially through Zambia: the Kabompo, Lungwebungu, Kafue, Luangwa, and the Zambezi itself, which flows through the country in the west and then forms its southern border with Namibia, Botswana and Zimbabwe. Its source is in Zambia but it diverts into Angola, and a number of its tributaries arise in Angola's central highlands. The edge of the Cuando River floodplain (not its main channel) forms Zambia's south-western border, and via the Chobe River that river contributes very little water to the Zambezi because most is lost by evaporation).