Color Landform Atlas: Illinois. Illinois Geography from NETSTATE. Bordered by the Mississippi River on the west and the Wabash and Ohio Rivers on the southeast and south, the landscape of Illinois can be grouped into three main regions; the Central Plains, the Shawnee Hills and the Gulf Coastal Plain.
The Central Plains: About 90% of Illinois is covered by the Central Plains region. These gently rolling fertile plains were carved and leveled by glaciers during the Ice Age. MapQuest Maps - Driving Directions - Map. Route Planner. Let us optimize your route---so you spend less time driving and more time doing.
Line By Line Copy & Paste Area Import Spreadsheet Tips: City - County Search for State of Illinois.