Badwater Basin

The sign is on the cliff behind you, small and white and faintly absurd: SEA LEVEL, 282 feet overhead. That is the arithmetic of Badwater Basin, the lowest ground in North America and the floor of a valley still sinking as the crust beneath it pulls apart. The salt flats run to nearly two hundred square miles, mostly sodium chloride with calcite, gypsum, and borax mixed through, and where groundwater rises and evaporates the crust buckles into the hexagonal polygons the park is known for. A quarter mile past the end of the boardwalk puts you out among them.

The name comes from the spring beside the parking area. The water is too saline to drink, and the story goes that a surveyor mapping the valley noted his mule would not touch it. The pool is not a roadside curiosity: a snail found nowhere else on earth lives in it, which is why the boardwalk is there and why you stay on it. Look west from the salt and Telescope Peak stands 11,049 feet above the same ground, more than two vertical miles inside a few horizontal ones. Look east and up for the sign.

Rain rearranges all of it, rarely. Under two inches fall here in an average year against an evaporation rate near 150 inches, so the shallow lakes that appear after a real storm are the briefest ghost of Pleistocene Lake Manly, gone in weeks. Summer on this salt is genuinely lethal ground. October through April, and carry water anyway.