The Musselshell River is a tributary of the Missouri River, 341.9 miles (550.2 km) long from its origins at the confluence of its North and South Forks near Martinsdale, Montana to its mouth on the Missouri River. It is located east of the Continental divide entirely within Montana in the United States. Counting its pre-confluence tributaries, it measures 425–500 miles (684–805 km) in length.

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.