SALT FLATS What is Salt Flats? Salt flats are dried-up desert lakes. They are forms by evaporation of a waterpool such as a lake or pond. This happens in climates where the rate of water evaporation exceeds the rate of precipitation , that is, in a desert . The salt and minerals dissolved in the water are left behind as a solid layer. World Biggest Salt Flat Salar de Uyuni is the biggest salt flat in the world standing at an elevation of 11,995 feet (3,656 m) and covering 4,086 square miles (10,852 sq km) the area is equal to 16 times the area of Jakarta and it’s all made of salt! It is located in southwest Bolivia. What’s make Salar de Uyuni unique? During the rainy season (between December-March), the salt is coated in a thin layer of water (as the rainwater has nowhere to drain), creating a mirror effect that stretches across the flat and provides stunning images of the sky, clouds, and everyting above them.