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Edwards County
Low elevation: <360 feet above mean sea level
Place: Bonpas Creek
7.5' quadrangle name: Grayville
PLSS: 2-16-3S-14W
Geology: Cahokia Alluvium in river valley
High elevation: >550 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: West Salem
PLSS: 3-31-2N-11E
Geology: Illinoian Vandalia till over Pennsylvanian Mattoon Formation
Area: 220.28 square miles
Total relief (approximate): 190 feet
Average percent slope: 1.21%
State of Illinois | Illinois Department of Natural Resources | University of Illinois