Devils Tower is anigneous intrusion or laccolith in the Black Hills near Hulett and Sundance in Crook County, northeastern Wyoming, above theBelle Fourche River. It rises dramatically 1,267 feet (386 m) above the surrounding terrain and the summit is 5,114 feet (1,559 m) above sea level.
Devils Tower was the first declared United States National Monument, established on September 24, 1906, by PresidentTheodore Roosevelt. The Monument's boundary encloses an area of 1,347 acres (545 ha).
In recent years, about 1% of the Monument's 400,000 annual visitors climb Devils Tower, mostly using traditional climbingtechniques.
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