National Natural Landmarks by county

Union County, IL

Giant City Geological Area
Giant City Geological Area, a National Natural Landmark in Union County, IL.

National Natural Landmarks in this county include:


← Back to listing of NNL sites in IL.

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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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