Salar de Uyuni is the world’s largest salt flat, spanning over 4,000 sq. miles (10,582 sq. km) in south-western Bolivia. It was part of a prehistoric salt lake, Lago Minchín. Unlike traditional deserts which are filled with sand, the Salar de Uyuni features vast expanses of glistening white salt. Salt water deposits seeped from the surrounding mountains. Since there is no outlet to the sea, they were deposited here which is the lowest point of the Altiplano plateau. That water then formed a giant lake. High salinity means that whilst this vast lake has long since evaporated under the sun, a thick crust of salt remains, forming what we now know as the Salt Flats of Salar de Uyuni. The Salar sits at approximately 3650 meters (11,975 ft) above sea level. There is no place else like it in the world.