Low Elevation
< 340 feet above mean sea level
Low Place
Big Muddy and Mississippi Rivers
Low Quad Name
Neelys Landing
Low PLSS
3-11-11S-4W
Low Geology
Cahokia Alluvium, river valley
High Elevation
> 811 feet above mean sea level
High Place
Grassy Knob
High Quad Name
Wolf Lake
High PLSS
3-34-10S-3W
High Geology
Loess hill over Lower Devonian carbonate bedrock
Area
599.01 square miles
Total Relief
417 feet
Percent Slope
2.25%