Bolivia
The flat is known as Salar de Uyuni, about 11,000 sq km (4,300 sq mi) of bright-white salt, rock formations and islands of cacti near the crest of the Andes. It is a source of salt, and covers a pool of brine which is rich in lithium; it contains between 50% to 70% of the world's known lithium reserves. The flat's size, its stable, highly reflective and flat surface, and its relative isolation has also made it a prized site for calibrating the distance measurement equipment of satellites.
