Low Elevation
< 435 feet above mean sea level
Low Place
Illinois River
Low Quad Name
Havana
Low PLSS
4-20-4N-4E
Low Geology
Cahokia Alluvium
High Elevation
> 780 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Farmington West
High PLSS
4-28-8N-4E
High Geology
Radnor till, possible moraine
Area
873.68 square miles
Total Relief
345 feet
Percent Slope
1.91%