Zambia tributaries rise in Angola's central highlands. The edge of the Cuando River floodplain (not its main channel) forms Zambia's southwestern border, and via the Chobe River that river contributes very little water to the Zambezi because most is lost by evaporation. Two of the Zambezi's longest and largest tributaries, the Kafue and the Luangwa, flow mainly in Zambia. Their confluences with the Zambezi are on the border with Zimbabwe at Chirundu and Luangwa town respectively. Before its confluence, the Luangwa River forms part of Zambia's border with Mozambique. From Luangwa town, the Zambezi leaves Zambia and flows into Mozambique, and
South Africa–Zimbabwe border South Africa–Zimbabwe border The border between South Africa and Zimbabwe is long, and follows the median line of the Limpopo River. The western tripoint with Botswana is located at the confluence of the Shashe River with the Limpopo. The location of the eastern tripoint with Mozambique is not entirely certain; it is situated either at the confluence of the Luvuvhu River with the Limpopo, or at a point nearby in the Limpopo defined by beacons on the Mozambique–Zimbabwe border. The border was established by the Pretoria Convention of 1881 and restated by the London Convention of 1884 which defined the