Claim: The Dells of the Wisconsin River  is a  5-mile (8-km) gorge with over 100 feet (30 m) high cliffs,  established as a State Natural Area in 1994 and owned by the Wisconsin Department of Natural Resources.
Evidence: The Dells of the Wisconsin River, also called the Wisconsin Dells (from French , or slab-like rocks), is a 5-mile (8-km) gorge on the Wisconsin River in south-central Wisconsin, USA. The cliffs, some over 100 feet (30 m) high, and side canyons are closed to the public to protect sensitive ecological features. It was established as a State Natural Area in 1994. The Dells of the Wisconsin River is owned by the Wisconsin Department of Natural Resources.