Low Elevation
< 350 feet above mean sea level
Low Place
Big Muddy River
Low Quad Name
Herrin
Low PLSS
3-33-7S-1E
Low Geology
Cahokia Alluvium and Equality Formation Carmi Member; lake bottom deposits
High Elevation
> 604 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Akin
High PLSS
3-1-7S-4E
High Geology
Illinois Vandalia till upland over Pennsylvanian Bond Formation ridge
Area
427.09 square miles
Total Relief
254 feet
Percent Slope
0.85%