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Alkalai salt flats are created as winter rains and runoff that flood the valley floor at the base of the Black Mountains with a shallow layer of water slowly evaporate; annual average rainfall is just 1.58 inches (40 mm). Death Valley National Monument Est. February 11, 1933. Est. as Death Valley National Park in 1994; 5,270 square miles (13,649 km2). Inyo County, CA.