Salt Pan Desert of Uyuni, in Bolivia, Desierto del Salar de Uyuni.

That almost infinite extension is the rest of a sea that filled all the plateau until Lake Titicaca and that, in the course of many millions of years, disappeared. Today Lake Titicaca, Lake Poopo, and salt pans of Coipasa and Uyuni are the rest of this sea, being the Salar de Uyuni the bigger,  and without a doubt, the most curious and attractive.