- U.S. Interior Highlands
The U.S. Interior Highlands is a mountainous region spanning eastern
Oklahoma , western and northernArkansas , southernMissouri , and the extreme southeast corner ofKansas . The name is designated by the United States Geological Survey to refer to the combined mountainous region of theOzarks andOuachita Mountains , which form a distinct physiographic division.cite web |title=Physiographic divisions of the conterminous U. S. |publisher=U.S. Geological Survey |url=http://water.usgs.gov/GIS/metadata/usgswrd/XML/physio.xml |accessdate=2007-12-06 ] It is the only major highland region between theRocky Mountains and theAppalachian Mountains in theUnited States . [cite web |url=http://www.srs.fs.usda.gov/4106/about/HotSpringsOffice.htm |title= Managing Upland Forests of the Midsouth|publisher= United States Forestry Service |accessdate=2007-10-13] [cite web |url=http://tapestry.usgs.gov/physiogr/physio.html|title= A Tapestry of Time and Terrain: The Union of Two Maps - Geology and Topography|publisher= United States Geological Survey |accessdate=2007-10-13]The region is occupied by the
Ozark mountain forests , an ecoregion oftemperate broadleaf and mixed forests . Parts of the area are covered by threenational forests : TheOuachita National Forest in Oklahoma and Arkansas, theOzark-St. Francis National Forest in Arkansas, and theMark Twain National Forest in Missouri.References
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