Gensburg-Markham Prairie, Protected grassland in Cook County, Illinois.
Gensburg-Markham Prairie is a protected grassland covering about 105 acres with open meadows, scattered wetlands, and native plants in the Chicago area. The land contains a mix of black silt and sandy soils that support different habitats and plant communities across the site.
The site formed during the Wisconsin glaciation when ancient glacial lakes deposited sand and silt layers. Early settlers avoided farming this area because poor drainage made cultivation difficult, which preserved the natural grassland.
Northeastern Illinois University manages this National Natural Landmark as part of the Indian Boundary Prairies, conducting research and educational programs.
Access begins from 159th Street in Markham, heading east toward the site. Visit during dry weather when possible, as wet conditions can make the ground muddy and walking more difficult.
The prairie shelters uncommon plants such as grape ferns and grass pink orchids that grow in few places in the region. These species thrive because of the specific blend of soil types and moisture conditions found only at this site.
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