In hilly northern Illinois, the park offers hiking, day use, camping and fishing, plus Millville, a National Historic Register site.
Apple River Canyon State Park is in the hilly northwest corner of Illinois near the Wisconsin border. Limestone bluffs, deep ravines, springs, streams and wildlife characterize this area. Once a part of a vast sea bottom that stretched from the Alleghenies to the Rockies, the scenic canyon area was formed by the action of the winding waters of the Apple River.
The park was established by the State of Illinois in 1932, and today consisting of 1,907 acres. Several other sites within Jo Daviess County are managed as part of the Apple River Canyon State Park Complex: Thompson and Salem Units, Iris and Jack Witkowsky Wildlife Area, Tapley Woods Natural Area, Hanover Bluff Natural Area, Hanover Bluff Nature Preserve, Wards Grove Nature Preserve, McKeague Unit Nature Preserve, Rall Woods Natural Area, and Apple River Canyon – Winston Tunnel Unit.