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Markham Prairie is the largest and highest quality prairie in Illinois and in large parts of adjacent states. As a mesic prairie intergrading between sand prairie and typical tall-grass prairie on loamy soil, it is a remnant of a distinct and formerly widespread biotic community type of the Central Lowlands biophysiographic province. The site is also an excellent example of undeveloped lakebed and beach ridge topography.
Location: Cook County, IL
Year designated: 1987
Ownership: Federal, 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