Castle Mountain (12,617 feet (3,846 m)) is in the Beartooth Mountains in the U.S. state of Montana, about 15 miles (24 km) east-northeast of Cooke City. It is located in the Gallatin National Forest and Custer National Forest, just outside the northern boundary of Yellowstone National Park in the Absaroka-Beartooth Wilderness.
The peak is the third tallest in the Beartooth Mountains, and the highest point in Carbon County, Montana
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