The economy of the Carlsbad area is based primarily on the mineral extraction sector; the city overlies the rich oil- and gas-producing formations of the Permian Basin and produces more potash than any other location in the United States. Carlsbad is home to the DOE's Carlsbad Field Office which operates the Waste Isolation Pilot Plant to safely store the transuranic nuclear wastes from the nation's defense sites. Tourism is a major factor with Carlsbad Caverns National Park, Guadalupe Mountains National Park, Lincoln National Forest, the Living Desert Zoo and Gardens State Park, and the annual Christmas on the Pecos Light Show all located within fifty miles of the city.