For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Heron Pond-Little Black Slough Natural Area
Heron Pond-Little Black Slough Natural Area is the largest remaining cypress-tupelo swamp in Illinois. The site contains a heron rookery and the valley is an outstanding example of alluvial, colluvial, and lacustrine sedimentation within an entrenched meandering valley system.
Location: Johnson County, IL
Year designated: 1972
Ownership: State, Private
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