Salar de Uyuni is the world's largest salt marsh, Bolivia

The Salar de Uyuni or Uyuni Salt Desert is a dried up body of water and the largest salt marsh in the world.Once upon a time, the Salar de Uyuni was an integral part of a prehistoric salt lake that occupied much of southwestern Bolivia. After the reservoir dried up, it became several small seasonal lakes and salt marshes. The unrivaled beauty and atmosphere of this salt desert makes it one of the most spectacular natural attractions in all of South America.