The southwestern portion of the county, drained by Indian Creek, is exceedingly hilly. The central and northern section is drained by Big River and its tributaries, Flat River, Davis Creek, Big Branch, Terre Bleu and Three Rivers. The name "Flat River" preserves the name of the town of Flat River, which was dissolved in the formation of the city of Park Hills in 1994. The valleys of these streams are excellently adapted to agricultural purposes, the cereals all doing well. On several of the steams mentioned, there are good mills, and many more excellent sites having sufficient water power to run a mill the entire year.