The Mesozoic-Cenozoic interior sag basins of Central Africa: The Late-Cretaceous-Cenozoic Kalahari and Okavango basins

Propagation of the East African Rift System into southern Africa has led to the formation of local depressions and the disruption of drainages, notably of the Kwando and Okavango Rivers. Lakes periodically occupied these depressions in the past. Large alluvial fans have developed in the depressions as a result of loss of flow confinement, and they currently support extensive wetlands (Okavango and Linyanti swamps).