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Ubehebe Crater; north tip of the Cottonwood Mountains. Volcanic crater is half a mile (one kilometer) wide and 500 to 777 feet (150 to 237 m) deep. The age of the crater is estimated from 2,000 to 7,000 years old. "Ubehebe" is a Timbisha Native American word meaning "Big basket in the rock." 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.