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Interior River Valleys and Hills

Last updated: August 23rd, 2020

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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.

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↑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.

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