The Big Belt Mountains are a mountain range located in central Montana, USA. They are part of the larger Rocky Mountains and stretch approximately 60 miles (97 kilometers) from north to south. The range is known for its rugged terrain, diverse wildlife, and scenic landscapes, making it a popular destination for outdoor activities such as hiking, camping, and fishing. The highest peak in the Big Belt Mountains is Castle Mountain, which rises to an elevation of 9,360 feet (2,850 meters). The area is also home to several lakes and rivers, including the Smith River, which flows nearby. The mountains are rich in geological history and provide habitat for various species, including elk and deer.