Harrison–Crawford State Forest is a protected landscape in southern Indiana spanning Harrison and Crawford counties and extending slightly into Orange County, with the Ohio River on its southern edge and the Blue River flowing through it. Established in 1932 from badly eroded farmland bought during the Great Depression, it grew into about 24,000 acres. The forest includes a mix of woodland, river scenery, and cave country, with O'Bannon Woods State Park and the Wyandotte Caves within its boundaries. It is valued for recreation and for habitat supporting species such as mussels, Eastern hellbender, cerulean warbler, bobcat, bald eagle, and Short's goldenrod.