Gensburg-Markham Prairie, Protected grassland in Cook County, Illinois.
The 105-acre Gensburg-Markham Prairie contains diverse ecosystems with open grasslands, scattered wetlands, and native plant communities in the Chicago metropolitan area.
The prairie formed during the Wisconsin glaciation when Lake Chicago deposited sand beaches, with early settlers avoiding cultivation due to poorly drained soil.
Northeastern Illinois University manages this National Natural Landmark as part of the Indian Boundary Prairies, conducting research and educational programs.
Visitors access the prairie from 159th Street in Markham, heading east for one mile to Whipple Avenue, then north for two blocks.
The prairie combines characteristics of black silt loam and sand prairies, supporting rare plants like grape fern, sundrop, and grass pink orchid.
Location: Illinois
GPS coordinates: 41.60690,-87.68780
Latest update: March 12, 2025 05:26
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