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Vermilion County
Low elevation: <490 feet above mean sea level
Place: Vermilion River
7.5' quadrangle name: Danville SE
PLSS: 2-19-18N-10W
Geology: Cahokia Alluvium in river valley
High elevation: >790 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Collison
PLSS: 2-6-20N-13W
Geology: Gifford Moraine
Area: 891.67 square miles
Total relief (approximate): 300 feet
Average percent slope: 0.89%
State of Illinois | Illinois Department of Natural Resources | University of Illinois