Zambia and 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 northeast 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
South Africa–Zimbabwe border boundaries of the South African Republic (the Transvaal Republic). The South African Republic subsequently became the Transvaal Colony and then part of the Union of South Africa, while north of the Limpopo Matabeleland became part of Southern Rhodesia which became Zimbabwe. There is a single crossing at Beit Bridge, where the South African N1 highway and the Zimbabwean A6 highway are joined by the Alfred Beit Road Bridge. A separate bridge carries a railway line, which is connected to Pretoria in South Africa and to Rutenga and Bulawayo in Zimbabwe. South Africa–Zimbabwe border The border between South Africa and Zimbabwe