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Southeastern Plains

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Map Legend & Subregion List

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NameColor on MapEPA Code‡
Blackland Prairie65a
Flatwoods/Blackland Prairie Margins65b
Sand Hills65c
Southern Hilly Gulf Coastal Plain65d
Northern Hilly Gulf Coastal Plain65e
Southern Pine Plains and Hills65f
Dougherty Plain65g
Tifton Upland65h
Fall Line Hills65i
Transition Hills65j
Coastal Plain Red Uplands65k
Atlantic Southern Loam Plains65l
Rolling Coastal Plain65m
Chesapeake Rolling Coastal Plain65n
Tallahasee Hills/Valdosta Limesink65o
Southeastern Floodplains and Low Terraces65p
Buhrstone/Lime Hills65q
Jackson Prairie65r

† 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 Southeastern Plains

The Southeastern Plains region encompasses much of the coastal plain of the southeastern U.S., stretching from Maryland southwest to Mississippi, with small amounts extending into Louisiana and Tennessee.

This region is mostly flat and relatively low in elevation, but not quite as flat or low as the Southern Coastal Plain and Mississippi Alluvial Plain. The climate is a humid subtropical climate, with stronger seasonality of temperatures as one moves north. Precipitation tends to be evenly distributed throughout the year.

Naturally this area had a mix of different forest types. Much of the area had pine forests, with Longleaf pine (Pinus palustris) a dominant species in much of the area, and Loblolly pine (Pinus taeda) extending farther north. There were some mixed oak-hickory-pine forests throughout the region, and the southern part of this region had some southeastern mixed forests, with a mixture of broadleaf evergreens, deciduous evergreens, and pines. Floodplains had deciduous forests, and there were also some cypress swamps.

This area is utilized for both agriculture and forestry. There are some small to moderate cities, but no large metro areas located in this region, although the northernmost reaches, which are narrow, include parts of the metro areas of Washington, DC and Baltimore, MD.

This region is bordered along the East coast by the Middle Atlantic Coastal Plain and farther south, by the Southern Coastal Plain. Along the Mississippi river, this region is bordered by the Mississippi Valley Loess Plains. Inland, on the east coast, this region is bordered by the Piedmont and Northern Piedmont regions. This region then wraps around the southernmost border of the Appalachians and borders several different ecoregions belonging to them.

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1. Wiken, E., Griffith, G. "North American Terrestrial Ecoregions - Level III", Commission for Environmental Cooperation, (2011) Web.