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Ecoregions of Illinois

Last updated: February 11th, 2021

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.

Name	†	Color 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

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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.