Home » Regions » North America » Eastern Temperate Forests » Southeastern USA Plains » Interior River Valleys and Hills

Interior River Valleys and Hills

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	EPA Code‡
Wabash-Ohio Bottomlands	○		72a
Glaciated Wabash Lowlands	○		72b
Green River-Southern Wabash Lowlands	○		72c
Upper Mississippi Alluvial Plain	○		72d
Middle Mississippi Alluvial Plain	○		72e
River Hills	○		72f
Southern Ozarkian River Bluffs	○		72g
Caseyville Hills	○		72h
Western Dissected Illinoian Till Plain	○		72i
Southern Illinoian Till Plain	○		72j
Cretaceous Hills	○		72k
Karstic Northern Ozarkian River Bluffs	○		72l
Wabash River Bluffs and Low Hills	○		72m

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

‡ This code refers to the US EPA's Level 4 ecoregion codes for the continental U.S., see here.

↑Progress

↑About the Interior River Valleys and Hills

The Interior River Valleys and Hills, referred to in some documents as the Interior River Lowland is a region of flat bottomlands and surrounding hills along the Mississippi, Missouri, Illinois, Ohio, and Wabash rivers, where these smaller rivers all flow together into the Mississippi. The region includes a narrow strip of eastern Iowa, a large region of western and southern Illinois, a portion of eastern Missouri, a small portion of southwestern Indiana, and a small region of western Kentucky.

Plant Lists & In-Region Search