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Ecoregions of Ohio

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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
Whitewater Interlobate Area
Pre-Wisconsinan Drift Plains
Marblehead Drift/Limestone Plain
Summit Interlobate Area
Monongahela Transition Zone
Pittsburgh Low Plateau
Knobs-Lower Scioto Dissected Plateau
Unglaciated Upper Muskingum Basin
Ohio/Kentucky Carboniferous Plateau
Erie/Ontario Lake Plain
Clayey High Lime Till Plains
Loamy High Lime Till Plains
Maumee Lake Plain
Mad River Interlobate Area
Darby Plains
Oak Openings
Paulding Plains
Low Lime Drift Plain
Erie Gorges
Mosquito Creek/Pymatuning Lowlands
Carter Hills
Permian Hills
Outer Bluegrass

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


Partially Complete
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Complete w/ Images

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About the Ecoregions of Ohio

Ohio is a roughly squarish state whose borders correspond poorly to geologic and ecological borders.

The entire state is located within the Eastern Temperate Forests, but it is split between four major subdivisions of this region. The northeast belongs to the Mixed Wood Plains, the most northerly portion of these forests, and a region that also includes coastal New England and explains the similarity of northeast Ohio to New England. This region was glaciated, but is less agriculturally fertile than the west of the state. The southeastern part of the state belongs to the Appalachians, more specifically, the Western Allegheny Plateau, and is hilly. Most of the western part of the state belongs to the Central USA Plains, an extremely flat and agriculturally fertile region that marks the transition between forests and the great plains. The far southwest of the state belongs to the Southeastern USA Plains, a region that extends much farther south and may explain why people say this part of Ohio feels like the south.

The southern limit of glaciation also cuts across Ohio, and although more of the state was glaciated than not, the southernmost portions of the state, and southeastern Ohio were unglaciated.


1. Woods, A.J, Omernik, J.M., Brockman, C.S., Gerber, T.D., Hosteter, W.D., Azevedo, S.H. "Ecoregions of Indiana and Ohio (Poster)", US Geological Survey (1998) Web.