Low Elevation
< 465 feet above mean sea level
Low Place
Illinois River
Low Quad Name
Chillicothe
Low PLSS
3-32-29N-3W
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 895 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
La Prairie Center
High PLSS
4-32-13N-8E
High Geology
Providence Moraine
Area
395.01 square miles
Total Relief
430 feet
Percent Slope
1.47%