sentences:  According to the 2010 census, the county has a total area of , of which (or 99.59%) is land and (or 0.41%) is water.Harrison Spring is located west of Corydon; it is in diameter and is over deep, making it the largest and deepest spring in Indiana.It rises from a solid rock in a level spot of land, and it outputs enough water to have turned flour mills in the past.