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Red River Bottomlands

Ecoregion in OK, TX, AR, LA

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The nearly flat Red River Bottomlands ecoregion is veneered with Holocene alluvium and has been widely cleared and drained for agriculture. It contains floodplains, low terraces, oxbow lakes, meander scars, backswamps, natural levees, and the meandering Red River. Potential natural vegetation is southern floodplain forest; it is unlike the oak – hickory – pine forest of higher, better drained, and lithologically distinct Ecoregions 35a and 35d. Western species, such as bur oak and Durand oak, were native to Ecoregion 35g but were typically absent from the Mississippi Alluvial Plain (73). The natural forest of Ecoregion 35g has been largely replaced by agriculture. Today, cropland is more extensive than in other parts of Ecoregion 35 in Arkansas. The Red River is almost continuously turbid; suspended sediment concentrations are usually much higher than in the Saline or Ouachita rivers of Ecoregion 35b due to land cover, land use, and upstream lithology differences.

— EPA

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Red River Bottomlands

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