Luangwa River ago, there was no way out and the Luangwa Rift filled with a Rift Valley Lake called the Madumabisa Lake, which rivalled Lake Malawi in size. The water of the lake overflowed in a river to the south-west, towards what is now the Kalahari, where it combined with the Okavango, Upper Zambezi, Cuando and Kafue rivers, emptying into the Limpopo River and flowing to the Indian Ocean. Several geological events combined to produce the current river systems. Faulting produced another graben just to the south of the Luangwa Rift, and running east-west: the Zambezi Rift Valley and the Chicoa Trough.
Zambezi River Authority Zambezi River Authority also plays a role in managing the use of water from Lake Kariba for irrigation and for domestic, industrial and institutional use. There has been tension between the countries that border the river. In the early 1990s, Zimbabwe proposed to build a pipeline to carry water south to supply the city of Bulawayo. Botswana also proposed to carry water south to Gaborone through an extension to the North-South Carrier (NSC). Some of the NSC water could be shared with South Africa. These projects raised concern with downstream countries threatened by loss of water. The question of claims