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The Prairie Ridge State Natural Area is a 4,101-acre (1,660 ha) collaborative natural area managed by the Illinois Department of Natural Resources. It is managed for the benefit of endangered, threatened, watch list, and area sensitive species associated with the tallgrass prairie habitat of south-central Illinois, especially the greater prairie chicken. The natural area is split between land parcels in Jasper County and Marion County, in the U.S. state of Illinois.