![]() These shapes are also invariably a metre or two across.These captivating patterns have been photographed as far apart as Bolivia, Chile, China, India (in the Rann of Kutch), Iran, Tunisia, and the U.S.In salt flats across the world, the salt on the surface forms ridges that join together in a patchwork of pentagons and hexagons.Why are salt flats around the world covered in a similar pattern of ridges? The groundwater is too salty for humans to drink.The underlying soil is highly saline - even if the water table is shallow. They reflect sunlight strongly and thus appear bright.Over time, all the water evaporates, leaving behind the dissolved minerals, usually salts.A salt flat forms from a natural water body whose recharge rate is lower than the evaporation rate.It is the largest in the world of its kind, and also contains more than half of the planet’s lithium reserves. ![]() Perhaps the world’s most well-known salt flat is the Salar de Uyuni in Bolivia.A salt flat is a natural landscape in which a large area of flat land is covered by salt.
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