Salar de Uyuni

The world's largest salt flat, a natural mirror in Bolivia/Natural Wonders

Salar de Uyuni in southwestern Bolivia is the world's largest salt flat, covering approximately 10,582 square kilometers at an elevation of 3,656 meters above sea level. It formed from the evaporation of prehistoric lakes and contains an estimated 10 billion tonnes of salt, with a crust varying from a few centimeters to several meters thick. During the rainy season, a thin layer of water transforms it into the world's largest natural mirror. The flat is also one of Earth's richest lithium reserves, containing roughly 50 to 70 percent of the world's known supply.