Illinois Level 4 Ecoregions Map
| er40a - Loess Flats and Till Plains |
| er47f - Rolling Loess Prairies |
| er52a - Savanna Section |
| er52b - Paleozoic Plateau/Coulee Section |
| er53a - Rock River Drift Plain |
| er53b - Kettle Moraines |
| er54a - Illinois/Indiana Prairies |
| er54b - Chicago Lake Plain |
| er54c - Kankakee Marsh |
| er54d - Sand Area |
| er54e - Chiwaukee Prairie Region |
| er54f - Valparaiso-Wheaton Morainal Complex |
| er54g - Rock River Hills |
| er71a - Crawford-Mammoth Cave Uplands |
| er71m - Northern Shawnee Hills |
| er71n - Southern Shawnee Hills |
| er72a - Wabash-Ohio Bottomlands |
| er72b - Glaciated Wabash Lowlands |
| er72d - Upper Mississippi Alluvial Plain |
| er72e - Middle Mississippi Alluvial Plain | er72e - River Hills |
| er72g - Southern Ozarkian River Bluffs | er72g - Western Dissected Illinoian Till Plain |
| er72j - Southern Illinoian Till Plain | er72j - Cretaceous Hills |
| er72l - Karstic Northern Ozarkian River Bluffs | er72l - Wabash River Bluffs and Low Hills |
| er73a - Northern Holocene Meander Belts | er73a - St. Francis Lowlands |
Based on Ecoregions developed by the EPA this map describe areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources, as well as similarity of climate that can assist Illinois gardenders.
