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The Katse Dam, a concrete arch dam on the Malibamat'so River in Lesotho, is Africa's second largest double-curvature arch dam after the Tekezé Dam in Ethiopia. Located just below the confluence of the Bokong River, which forms the western arm of the Katse reservoir, the dam is part of a larger project which will eventually include five large dams in remote rural areas.

The potential of the project was identified by the South African civil engineer Ninham Shand in 1953 as a possible means to supplement the water supply of South Africa's industrial heartland in the Witwatersrand. The World Bank arranged a treaty between the governments of South Africa and Lesotho, allowing the project to proceed.

Source: Wikipedia