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Salar de Uyuni (or Salar de Tunupa) is the world's largest salt flat at 10,582 square kilometers (4,086 sq mi). It is located in the Potosí and Oruro departments in southwest Bolivia, near the crest of the Andes, and is at an elevation of 3,656 meters (11,995 ft) above mean sea level.The Salar was formed as a result of transformations between several prehistoric lakes.
The Salar de Uyuni in Bolivia is the worlds largest salt flat. The salt is over 10 meters thick in the center. In the dry season, the salt planes are a completely flat expanse of dry salt, but in the wet season, it is covered with a thin sheet of water that is still drivable.
Salar de Uyuni is a magical place: When covered by water, the world's largest salt flat becomes a mirror, and anyone walking across it appears to be walking on clouds. The salt crust, which covers 10 583 square kilometres in southwestern Bolivia at 11,995 feet above sea level, is nearly flat, which makes it ideal for calibrating the altimeters of satellites. Salar de Uyuni's origins lie in prehistoric lakes; it is a major breeding ground for several species of flamingos.