Low Elevation
< 340 feet above mean sea level
Low Place
Wabash River
Low Quad Name
Emma
Low PLSS
3-27-7S-10E
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 580 feet above mean sea level
High Place
Boyd Hill
High Quad Name
Centerville
High PLSS
3-2-4S-9E
High Geology
Thin Illinois Vandalia till over Pennsylvanian Mattoon Formation ridge
Area
496.49 square miles
Total Relief
240 feet
Percent Slope
0.91%