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
Zambia other major tributary is the Kalungwishi River, which flows into it from the east. The Luvua River drains Lake Mweru, flowing out of the northern end to the Lualaba River (Upper Congo River). Lake Tanganyika is the other major hydrographic feature that belongs to the Congo basin. Its south-eastern end receives water from the Kalambo River, which forms part of Zambia's border with Tanzania. This river has Africa's second highest uninterrupted waterfall, the Kalambo Falls. Zambia is located on the plateau of Central Africa, between 1000–1600 m above sea level. The average altitude of 1200 m generally has a moderate