Magkadigkadi. The largest salt-flats on Earth. With Mike Main and Andrew St Pierre White
The Makgadikgadi Pans is a series of salt pans situated in the middle of the dry savanna of north-eastern Botswana, is one of the largest salt flats in the world. The pan is all that remains of the formerly enormous Lake Makgadikgadi, which

once covered an area larger than  Switzerland, but dried upseveral thousand years ago.Lying southeast of the  Okavango Delta in Botswana, and surrounded by the 

Kalahari Desert, Makgadikgadi is technically not a single pan but many pans with sandy desert in between, the largest being Sua (Sowa), Nwetwe and Nxai Pans. The largest individual pan is about 1,900 sq mi (4,921.0 km2). Incomparison, Salar de Uyuni in Bolivia is a single salt flat of 4,100 sq mi (10,619.0 km2), rarely has

much water, and is generally claimed to be the world's largest salt pan. A dry

salty clay crust most of the year, the pans are seasonally covered with water

and grass, and are then a refuge for birds and animals in this very arid part

of the world. The climate is hot and dry but with regular annual rains.

Kalahari expert Mike Main explores the area with overland

explorer, Andrew St Pierre White. This film was made in 2006.