Uncompahgre National Forest is a U.S. National Forest covering 955,229 acres (1,492.55 sq mi, or 3,865.68 km²) in (in descending order of land area) parts of Montrose, Mesa, San Miguel, Ouray, Gunnison, San Juan, and Delta Counties in western Colorado. It borders the San Juan National Forest to the south.Within the national forest boundaries can be found the arid Uncompahgre Plateau and the northern portion of the San Juan Mountains.