Beall Woods State Park is an Illinois state park on 635 acres bordering the Wabash River and Keensburg in Wabash County, Illinois in the United States. 329 acres of the state park is an old-growth forest designated as a Natural Area by the state of Illinois. The trees within the forest consist overwhelmingly of hardwoods of the former Eastern Woodlands ecosystem. Portions of Beall Woods State Park have been designated a National Natural Landmark as the Forest of the Wabash. The state park was created in 1966. It is located at Cr-16, Mount Carmel, IL 62863.