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Jasper County
Low elevation: <440 feet above mean sea level
Place: Embarras River
7.5' quadrangle name: Landes
PLSS: 2-15-5N-14W
Geology: Cahokia Alluvium in river valley
High elevation: >620 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Wheeler
PLSS: 3-32-8N-8E
Geology: Hagarstown ridge
Area: 492.90 square miles
Total relief (approximate): 180 feet
Average percent slope: 0.65%
State of Illinois | Illinois Department of Natural Resources | University of Illinois