Devils Tower National Monument (Wyo.)

Devils Tower (also known as Matȟó Thípila or Bear Lodge) is a laccolithic butte, composed of igneous rock in the Bear Lodge Ranger District of the Black Hills, near Hulett and Sundance in Crook County, northeastern Wyoming, above the Belle Fourche River. It rises 1,267 feet (386 m) above the Belle Fourche River, standing 867 ft (264 m) from summit to base. The summit is 5,112 ft (1,558 m) above sea level. Devils Tower National Monument was the first United States national monument, established on September 24, 1906, by President Theodore Roosevelt. The monument's boundary encloses an area of 1,347 acres (545 ha).