(Iowa)
Ledges State Park is a state park in Boone County, Iowa, United States, located approximately four miles (6.4 km) south of the city of Boone. The park contains a sandstone gorge carved by Pea's Creek, a tributary of the Des Moines River. The gorge is 100 feet (30 m) deep in places, with concretions jutting from the cliffs. (Ref: https://en.wikipedia.org/wiki/Ledges_State_Park)