The Gunnison National Forest is a U.S. national forest covering 1,672,136 acres (2,612.71 sq mi, or 6,766.89 km2) in Mesa, Gunnison, Hinsdale and Saguache Counties in Western part of Colorado. The peaks, valleys and waters of the forest offer endless possibilities for exploration. Hiking and mountain biking are among the most popular activities in Gunnison National Forest.