U.S. Interior Highlands
The U.S. Interior Highlands is a mountainous highland region spanning eastern Oklahoma, western and northern Arkansas, southern Missouri, and the extreme southeast corner of Kansas. The name is designated by the United States Geological Survey to refer to the combined mountainous region of the Ozarks and Ouachita Mountains, which form a distinct physiographic division. It is the only major highland region between the Rocky Mountains and the Appalachian Mountains in the United States.
The region is occupied by the Ozark mountain forests, an ecoregion of temperate broadleaf and mixed forests. Parts of the area are covered by three national forests: The Ouachita National Forest in Oklahoma and Arkansas, the Ozark-St. Francis National Forest in Arkansas, and the Mark Twain National Forest in Missouri.
- "Physiographic divisions of the conterminous U. S.". U.S. Geological Survey. Retrieved 2007-12-06.
- "Managing Upland Forests of the Midsouth". United States Forestry Service. Retrieved 2007-10-13.
- "A Tapestry of Time and Terrain: The Union of Two Maps - Geology and Topography". United States Geological Survey. Retrieved 2007-10-13.
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