Low Elevation
< 510 feet above mean sea level
Low Place
Illinois River
Low Quad Name
Seneca
Low PLSS
3-30-33N-6E
Low Geology
Cahokia Alluvium
High Elevation
> 700 feet above mean sea level
High Place
unnamed hilltop
High Quad Name
Stavanger
High PLSS
3-6-34N-6E
High Geology
Ransom Moraine
Area
426.49 square miles
Total Relief
190 feet
Percent Slope
0.54%