Sonoran Desert National Monument

Sonoran Desert National Monument is located south of Goodyear and Buckeye and east of Gila Bend, Arizona. Created by Presidential proclamation on January 17, 2001, the 496,337 acre monument is managed by the U.S. Bureau of Land Management (BLM), an agency within the U.S. Department of the Interior. Source: Wikipedia

Check out The Bureau of Land Management website (click here).