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Illinois, United States of America (40.07966 -89.43373)
Though Illinois lies entirely in the Interior Plains, it does have some minor variation in its elevation. In extreme northwestern Illinois, the Driftless Area, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Southern Illinois includes the hilly areas around the Shawnee National Forest.
Des Plaines State Fish and Wildlife Area, Cottage Road, Lorenzo, Will County, Illinois, United States of America (41.37821 -88.21537)
Coordinates: 41.35656 -88.23099 41.39970 -88.19313 - Minimum elevation: 152 m - Maximum elevation: 197 m - Average elevation: 163 m
Douglas Park, 1401, North Lawndale, Chicago, Cook County, Illinois, 60623, United States of America (41.86007 -87.69935)
Coordinates: 41.85550 -87.70304 41.86637 -87.69566 - Minimum elevation: 176 m - Maximum elevation: 216 m - Average elevation: 184 m