The Crazy Mountains, often called the Crazies, is a mountain range in the Central Montana Alkalic Province in the U.S. state of Montana. They are a part of the northern Rocky Mountains.

Lewis and Clark National Forest is located in west central Montana, United States. Spanning 2,912 square miles (7,500 km2), the forest is managed as two separate zones. The eastern sections, under the Jefferson Division, is a mixture of grass and shrublands dotted with "island" pockets of forested areas. Here, cattle leases to local ranchers as well as timber harvesting are the norm. The western Rocky Mountain Division, which straddles the Continental divide, is managed chiefly for environmental preservation, as much of the land has been designated as wilderness. Forest headquarters are located in Great Falls, Montana. Local ranger district offices have been established in Choteau, Harlowton, Neihart, Stanford, and White Sulphur Springs.