The Makgadikgadi Pans area is part of the Kalahari Basin, is– one of the largest salt pans in the world, second to only Salar de Uyuni salt flats of Bolivia.

For much of the year, most of this desolate area remains waterless and extremely arid; devoid of life. But during raining season, the two largest pans – Sowa to the east and Ntwetwe to the west – flood, attracting wildlife – zebra and wildebeest on the grassy plains – and most spectacularly
flamingos at Sowa and Nata Sanctuary. 

Read more at Botswana Tourism official website.