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Monroe County, Illinois, United States of America (38.27223 -90.17925)
The western part of the county on the Mississippi River is part of the American Bottom floodplain, while the eastern portion of the county is relatively flat and was originally prairie. The transition zone between has high bluffs of limestone and dolomite and has distinctive Karst topography with numerous sinkholes, caves, and springs.
Eagerville, Eagarville, Macoupin County, Illinois, 62023, United States of America (39.11171 -89.78398)
Coordinates: 39.09171 -89.80398 39.13171 -89.76398 - Minimum elevation: 170 m - Maximum elevation: 214 m - Average elevation: 196 m
Mount Prospect, Wheeling Township, Cook County, Illinois, United States of America (42.06642 -87.93729)
Coordinates: 42.02256 -87.97564 42.10239 -87.88862 - Minimum elevation: 192 m - Maximum elevation: 250 m - Average elevation: 207 m