Underneath the salt crust lies a thick layer of brine, which is a concentrated solution of salt and water. It is a vast expanse of dried-up prehistoric lakes, and the salt flat itself is the result of the evaporation of water from these ancient lakes. Salar de Uyuni is made primarily of salt. Located in the Bolivian Altiplano, it is the world’s largest salt flat and is located at a high altitude of 3,656 meters (10,000 feet) above sea level. The Salar de Uyuni is a 10,582 square kilometer expanse of cracked white salt, left behind when an ancient salt lake named Coipasa dried up thousands of years ago. Think 10 billion tons of salt sprawling across an endless desert. The Salar de Uyuni is one of the most spectacular adventure-travel destinations on Earth.
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