The Adventure Hiking Trail runs through O'Bannon Woods State Park and Harrison-Crawford State Forest. This 25-mile trail is a National Recreation Trail, it is one of Indiana's longest and most interesting backpacking experiences. It is also part of the American Discovery Trail. Natural escarpments overlook Indian Creek, Blue River, and the Ohio River. In addition, the karst landscape, including caves and sinkholes, and a diverse array of native vegetation and wildlife all contribute to the hiker's enjoyment.