* Astronomy

Lake Makgadikgadi is an ancient lake that existed in what is now the Kalahari Desert in Botswana. It may have once covered as much as 80,000 km² and been 30 m deep. The Okavango, Zambezi, and Cuando rivers once all emptied into the lake.
Approximately 3 million years ago, strong easterly winds brought about the formation of elongated dunes which ran from east to west across the middle of the Kalahari Desert. During wetter times, these dunes channelled the flow of the great rivers of the area, the Okavango, Chobe, and Zambezi, eastwards with the Limpopo River into the Indian Ocean.
About 2 million years ago, the formation of the fault known as the Kalahari-Zimbabwe axis, which runs from the Zimbabwe capital Harare through its second-largest city Bulawayo and ends in the eastern side of the Kalahari, created an enormous basin and forced these rivers to flow into and fill up the basin. Lake Makgadikgadi was thus created.

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Latitude: 20°43'0"S, Longitude: 24°57'3"E