A linear belt of structural weakness extends from South-West Africa northeasterly across Northern Rhodesia to Tanganyika, Kenya, and even Somalia. In Northern Rhodesia it is called the mid-Zambezi-Luangwa rift, is 750 miles long, and leads into the Ruaha rift in Tanganyika. It is crossed by the east-west lower Zambezi rift zone in the southern part of the country and by the Nyasa rift in the Rungwe volcanic area. At both intersections carbonatite occurrences are known; they are related to the tectonics.

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