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Ouachita Mountains

Ecoregion in Ouachita Mountains in OK, AR

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The Ouachita Mountains ecological region is made up of sharply defined east-west trending ridges, formed through erosion of compressed sedimentary rock formations. The Ouachitas are structurally different from the Boston Mountains (38), more folded and rugged than the lithologically distinct Ozark Highlands (39), and physiographically unlike the Arkansas Valley (37), South Central Plains (35), and Mississippi Alluvial Plain (73). Potential natural vegetation is oak-hickory-pine forest, which contrasts with the oak-hickory forest that dominates Ecoregion 39 and the northern part of the Boston Mountains (38). Most of this region is now in loblolly and shortleaf pine. Commercial logging is the major land use in the region.

— EPA

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