For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.


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.

← Back to listing of all states and territories.





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.

Last Updated: June 28, 2012