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Coles County
Low elevation:<550 feet above mean sea level
Place: Embarras River
7.5' quadrangle name: Charleston South
PLSS: 3-22-11N-9E
Geology: Cahokia Alluvium
High elevation: >780 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Westfield West
PLSS: 3-30-12N-11E
Geology: Nevins Moraine
Area: 504.87 square miles
Total relief (approximate): 230 feet
Average percent slope: 0.84%
State of Illinois | Illinois Department of Natural Resources | University of Illinois