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Pulaski County
Low elevation: <300 feet above mean sea level
Place: Ohio River
7.5' quadrangle name: Cairo
PLSS: 3-1-17S-1W
Geology: Cahokia Alluvium in river valley
High elevation: >500 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Dongola
PLSS: 3-4-14S-1W
Geology: Mississippian Middle Valmeyeran ridge
Area: 201.20 square miles
Total relief (approximate): 220 feet
Average percent slope: 0.96%
State of Illinois | Illinois Department of Natural Resources | University of Illinois