Chocolate Mountain Aerial Gunnery Range

The Chocolate Mountain Aerial Gunnery Range (CMAGR) is a bombing range operated by the United States Marine Corps, located in Southern California. == Range description == The range is a 459,000 acres (1,860 km2) open-area, approximately 20 miles wide, east to west, and 50 miles long, northwest to southeast, with a special-use airspace of 700 square miles (1,800 km2) which is used for aerial bombing and live fire aerial gunnery practice.

Source: Wikipedia — Chocolate Mountain Aerial Gunnery Range (CC BY-SA 4.0)