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[[File:Oklahoma topographic map-en.svg|thumb|right|Geographic map of Oklahoma]]
The ''' Geography of Oklahoma''' encompasses terrain and ecosystems ranging from arid plains to subtropical forests and mountains. [[Oklahoma]] contains 10 distinct [[ecoregion|ecological regions]], more per square mile than in any other state by a wide margin.<ref name="Oklahoma Terrain">{{cite web|date=2006-01-12 |url=http://www.travelok.com/atv/index.asp |title=Oklahoma, All Terrain Vacation |work=TravelOK |publisher=TravelOK.com |accessdate=2006-07-15 |deadurl=yes |archiveurl=https://web.archive.org/web/20060709205916/http://travelok.com/atv/index.asp |archivedate=July 9, 2006 }}</ref>
The state has four primary mountain ranges: the [[Arbuckle Mountains]], the [[Wichita Mountains]], the [[Ozark Mountains]] and the [[Ouachita Mountains]].<ref name="The Geography of Oklahoma"/> Part of the U.S. Interior Highlands region, the Ozarks and Ouachitas form the only major highland region between the [[Rocky Mountains]] and the [[Appalachians]].<ref>{{cite web|date=2007-03-07 |url=http://www.srs.fs.usda.gov/4159/about/HotSpringsOffice.htm |title=Managing Upland Forests of the Midsouth |publisher=USDA Forest Service |accessdate=2007-07-31 |deadurl=yes |archiveurl=https://web.archive.org/web/20080622180232/http://www.srs.fs.usda.gov/4159/about/HotSpringsOffice.htm |archivedate=2008-06-22 |df= }}</ref>
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