Shashe River Shashe is a sand filled channel, with extensive alluvial aquifers in the river channel and below the alluvial plains. These supply water for a number of irrigation schemes including Sibasa and Shashi. More than two million years ago, the Upper Zambezi River used to flow south through what is now the Makgadikgadi Pan (presently a vast seasonal wetland) to the Shashe River and thence the Limpopo River. There is a road bridge and a rail bridge south of Francistown. The lower Shashe River forms the border between Botswana and Zimbabwe and is unbridged. However, at Tuli, both sides of the
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