 According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.4%) is water.The county is part of the greater Cumberland River watershed.The southern part of the county is drained by tributaries of the Caney Fork, the northeastern part by tributaries of the Obey River, and the north-central and northwestern parts of the county drain into the Cumberland's Cordell Hull Lake impoundment.