The Devil's Golf Course is a large salt pan on the floor of Death Valley, located in the Mojave Desert within Death Valley National Park, in eastern California. Although its exact boundaries are poorly defined, it extends from the vicinity of the Ashford Mill site to the Salt Creek Hills, a distance of about 40 miles. The salt pan is essentially a gigantic, dried up bed of a lake that once covered the valley to a depth of 30 feet. Some 2,000 to 4,000 years ago the lake dried up leaving behind dissolved minerals which, over thousands of years, were sculpted by weathering processes into fantastic shapes. The salt pan is so incredibly serrated that the 1934 National Park Service guide book to Death Valley National Monument stated that "only the devil could play golf" on its surface. Shortly after, the salt pan came to be known as the Devil's Golf Course.