Illinois

There are 18 National Natural Landmark sites located within the state of Illinois. Natural features represented include large river and small stream valley ecosystems, diverse glacial landforms, and remnants of forest and prairie communities that once dominated the Illinois landscape. The sites in Illinois received NNL designation between 1965 and 1987. The sites range in size from 53 acres to over 6,500 acres and are owned by a variety of landowners including the U.S. Forest Service, Illinois Department of Natural Resources, the University of Illinois, County Forest Preserve Districts, The Nature Conservancy and private individuals.

Below is a map of sites in Illinois.

National Natural Landmark sites are located in the following counties: Alexander, Carroll, Cook, Jackson, Johnson, Lake, McLean, Monroe, Piatt, Pope, Pulaski, Union, and Wabash.

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To learn more about National Natural Landmarks in Illinois, select a site from the list or the map below:

Allerton Natural Area Bell Smith Springs Busse Forest Nature Preserve Forest of the Wabash Fults Hill Prairie Nature Preserve Funks Grove Giant City Geological Area Heron Pond-Little Black Slough Natural Area Horseshoe Lake Nature Preserve Illinois Beach Nature Preserve LaRue-Pine Hills Ecological Area Little Grand Canyon Area Lower Cache River Swamp Lusk Creek Canyon Markham Prairie Mississippi Palisades Volo Bog Nature Preserve Wauconda Bog Nature Preserve

Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.

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