The area of Kankakee River State Park is 16.187 square kilometers.
Kankakee River State Park (look for the Rock Creek area for the canyon, forested areas are south of the river and near the Potowatomi Campgrounds). Matthiessen State Park - pretty much the whole park is a forested canyon. Starved Rock State Park - lots of forest, NUMEROUS canyons. Apple River Canyon State Park Giant City State Park - South of Carbondale off State Highway 51 and west of Makanda. Beautiful bluffs, forests, and it is near the Illinois wine country in the Cobden and Anna area.
The area of Guadalupe River State Park is 7,845,640.5461068805 square meters.
The area of Ochlockonee River State Park is 1,586,367.7175808 square meters.
The area of Yampa River State Park is 12.594 square kilometers.
The area of Hillsborough River State Park is 13.691 square kilometers.
The area of Oleta River State Park is 4,220,871.2485632 square meters.
The area of Econfina River State Park is 13.666 square kilometers.
The area of Crystal River Preserve State Park is 121.406 square kilometers.
Cossatot River State Park-Natural Area was created in 1988.
The area of Crystal River Archaeological State Park is 246,858.2417664 square meters.
The area of Bidwell-Sacramento River State Park is 1,412,352.8914176 square meters.
The area of Lower Wekiva River Preserve State Park is 72.843 square kilometers.