The salt flats of Badwater. The "flats" aren't so flat in places. The crust of salt on the surface gets wedged up into polygonal patterns, like those seen here, during cycles of wetting and drying during which the salt precipitates out of the water and incrementally adds to the crust which was there before. The polygonal forms are somewhat similar to frost polygons that form in Artic and Antarctic soils after cycles of freeze-thaw.