Salar de Uyuni is the world's biggest salt flat at 10,582 sq kilometers ( 4,086 sq mi ). It is located in the Potosí and Oruro departments in southwest Bolivia, close to the crest of the Andes and is at an elevation of 3,656 meters ( 11,995 ft ) above mean sea level. The Salar was created resulting from transformations between a number of prehistoric lakes. It is covered by a couple of meters of salt crust, which includes a terrific flatness with the average altitude versions within one meter over the entire section of the Salar. 

The crust serves as a source of salt and covers a pool of brine, which is especially rich in lithium. It includes 50 to 70% of the world's lithium reserves, which can be in the process of being extracted. The huge area, crystal clear skies, and outstanding flatness of the surface area make the Salar a perfect object for calibrating the altimeters of Earth observation satellites.  

The Salar serves as the major transport route across the Bolivian Altiplano and is an important breeding ground for many varieties of pink coloured flamingos. Salar de Uyuni is also a climatological transitional zone since the towering tropical cumulus congestus and cumulus incus clouds that form in the eastern a part of the salt flat through the summer season cannot permeate beyond its drier western edges, near the Chilean border and the Atacama Desert.

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