Low Elevation
< 410 feet above mean sea level
Low Place
Wabash River
Low Quad Name
Russelville
Low PLSS
2-21-5N-10W
Low Geology
Cahokia Alluvium
High Elevation
> 640 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Flat Rock
High PLSS
2-35-6N-12W
High Geology
Illinois Vandalia till upland over Pennsylvanian Mattoon Formation
Area
440.97 square miles
Total Relief
230 feet
Percent Slope
0.91%