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Gallatin County
Low elevation: <320 feet above mean sea level
Place: Ohio River
7.5' quadrangle name: Saline Mines
PLSS: 3-7-11S-10E
Geology: Cahokia Alluvium in river valley
High elevation: >840 feet above mean sea level
Place: Buzzards Point and nearby hilltop
7.5' quadrangle name: Karbers Ridge
Geology: Pennsylvanian Caseyville Sandstone ridge
Area: 324.70 square miles
Total relief (approximate): 520 feet
Average percent slope: 1.36%
State of Illinois | Illinois Department of Natural Resources | University of Illinois