Salar de Uyuni, Bolivia

 This true-colour composite satellite image shows a very stark contrast between the very white salt plains from Salar du Uyuni and the nearby brown mountainous region. At the top of the image, a salt processing plant creates small black and turquoise blue pools.

Salar de Uyuni is the world's largest salt flat at 10,582 square kilometers (4,086 sq mi). It is located in southwest Bolivia, near the crest of the Andes, at an elevation of 3,656 meters (11,995 ft) above sea level.

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 elevation variations within one meter over the entire area of the Salar. Due to its exceptional flatness, and the often clear skies of the area, the surface make the Salar an ideal object for calibrating the altimeters of Earth observation satellites.

The plains are also exceptionally rich in lithium, holding over 50% of the world's known reserves for the sought-after resource.

The image was taken by Landsat 8 (NASA/USGS) in November 2017.

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