Low Elevation
< 450 feet above mean sea level
Low Place
Illinois River
Low Quad Name
Florid
Low PLSS
4-32-15N-10E
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 950 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Whitefield
High PLSS
4-34-15N-8E
High Geology
Providence Moraine, Wisconsin end moraine
Area
865.96 square miles
Total Relief
500 feet
Percent Slope
1.23%