Low Elevation
< 550 feet above mean sea level
Low Place
Embarras River
Low Quad Name
Charleston South
Low PLSS
3-22-11N-9E
Low Geology
Cahokia Alluvium
High Elevation
> 780 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Westfield West
High PLSS
3-30-12N-11E
High Geology
Nevins Moraine
Area
504.87 square miles
Total Relief
230 feet
Percent Slope
0.84%