Salar de Uyuni in Bolivia is the world's largest salt flat at 4,086 sq miles. The Salar was formed as a result of transformations between several prehistoric lakes. It is covered by a few meters of salt crust, which has an extraordinary flatness with the average altitude variations within one meter over the entire area of the Salar.
The crust serves as a source of salt and covers a pool of brine, which is exceptionally rich in lithium. It contains 50 to 70% of the world's lithium reserves, which is in the process of being extracted. Salar de Uyuni is a dream-like landscape where it's almost impossible to distinguish where the sky ends and the ground begins.
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