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Ecoregions of Illinois

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To check where a specific point lies, you can look it up in our Ecoregion Locator.

Map Legend & Subregion List

This list will help you navigate the regions in case you have problems with viewing or clicking the interactive map above.

NameColor on Map
Savanna Section
Illinois/Indiana Prairies
Rock River Drift Plain
Blufflands and Coulees
Chicago Lake Plain
Kankakee Marsh
Sand Area
Southern Shawnee Hills
River Hills
Southern Ozarkian River Bluffs
Western Dissected Illinoian Till Plain
Wabash River Bluffs and Low Hills
Southern Illinoian Till Plain
Cretaceous Hills
Karstic Northern Ozarkian River Bluffs
St. Francis Lowlands
Northern Holocene Meander Belts
Loess Flats and Till Plains
Chiwaukee Prairie Region
Rolling Loess Prairies
Valparaiso-Wheaton Morainal Complex
Rock River Hills
Kettle Moraines
Northern Shawnee Hills
Crawford-Mammoth Cave Uplands
Wabash-Ohio Bottomlands
Glaciated Wabash Lowlands
Upper Mississippi Alluvial Plain
Middle Mississippi Alluvial Plain

† Status: ✓ = Complete ○ = Needs Image … = Incomplete ∅ = Stub Only


Partially Complete
With Images
Complete w/ Images

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About the Ecoregions of Illinois

Illinois is a state in the Midwestern U.S.; although its western border follows the Mississippi river, its southern border follows the Ohio river, and part of its southeastern border follows the Wabash river, its northern and eastern borders cut across ecological borders. The state has several glacial borders in it as well. Although most of the state was glaciated, its northwesternmost and southernmost parts escaped glaciation, and there are also some areas that were glaciated a long time ago but not in the most recent glacial period.