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Salar de Uyuni (Salt Flats of Uyuni) seen from the Incahuasi island in Bolivia on December 10, 2015. The Salar de Uyuni is the world's largest salt flat. It spreads over 10,582 square kilometers (4,086 sq mi) and is at an elevation of 3,656 meters (11,995 ft) above mean sea level. The Salar contains large amounts of sodium, potassium, lithium and magnesium as well as borax. Photo by Bénédicte Desrus