Oklahoma

===Protected lands===

Oklahoma has fifty-one [[state park]]s,<ref>{{cite web |year=2004|publisher=Oklahoma Parks Department | access-date=August 2, 2007 | url=http://www.oklahomaparks.com/index.asp| title=Oklahoma State Parks |archive-url=https://web.archive.org/web/20070727031241/http://www.oklahomaparks.com/index.asp <!--Added by H3llBot--> |archive-date=July 27, 2007}}</ref> six [[national park]]s or protected regions,<ref name="Oklahoma national parks">{{cite web |year=2007|publisher=National Park Service | access-date=August 2, 2007 | url=http://home.nps.gov/state/ok/index.htm?program=parks| title=Oklahoma National Park Guide}}</ref> two [[United States National Forest|national protected forests]] or [[grassland]]s,<ref>{{cite web |date=May 1, 2005|publisher=[[United States Forest Service|United States Department of Agriculture Forest Service]] | access-date=August 2, 2007 | url=http://www.fs.fed.us/recreation/map/state_list.shtml#Oklahoma| title=National Forests}}</ref> and a network of wildlife preserves and conservation areas. Six percent of the state's 10 million acres (40,000&nbsp;km<sup>2</sup>) of forest is public land,<ref name="OK forests"/> including the western portions of the [[Ouachita National Forest]], the largest and oldest national forest in the [[Southern United States]].<ref>{{cite web |date=May 10, 2005|publisher=[[United States Forest Service|United States Department of Agriculture Forest Service]]| access-date=August 2, 2007 | url=http://www.fs.usda.gov/ouachita/| title=Ouachita National Forest}}</ref>

With {{Convert|39000|acre|km2}}, the [[Tallgrass Prairie Preserve]] in north-central Oklahoma is the largest protected area of [[tallgrass prairie]] in the world and is part of an [[ecosystem]] that encompasses only ten percent of its former land area, once covering fourteen states.<ref>{{cite web| year=2007| url=http://www.nature.org/wherewework/northamerica/states/oklahoma/preserves/tallgrass.html| title=Tallgrass Prairie Preserve| publisher=The Nature Conservatory| access-date=July 31, 2007| archive-url=https://web.archive.org/web/20110223051941/http://www.nature.org/wherewework/northamerica/states/oklahoma/preserves/tallgrass.html| archive-date=February 23, 2011| df=mdy-all}}</ref> In addition, the [[Black Kettle National Grassland]] covers {{Convert|31300|acre|km2}} of prairie in southwestern Oklahoma.<ref>{{cite web |date=July 24, 2007|publisher=USDA Forest Service| access-date=August 2, 2007 | url=http://www.fs.fed.us/r3/cibola/districts/black.shtml| title=Black Kettle National Grassland}}</ref> The [[Wichita Mountains Wildlife Refuge]] is the oldest and largest of nine [[National Wildlife Refuge]]s in the state<ref>{{cite web| publisher=U.S. Fish and Wildlife Service| access-date=August 17, 2007| url=http://www.fws.gov/refuges/refugeLocatorMaps/Oklahoma.html| title=Refuge Locator Map—Oklahoma| archive-date=March 21, 2013| archive-url=https://web.archive.org/web/20130321031302/http://www.fws.gov/refuges/refugeLocatorMaps/Oklahoma.html}}</ref> and was founded in 1901, encompassing {{Convert|59020|acre|km2}}.<ref>{{cite web| publisher=U.S. Fish and Wildlife Service| access-date=August 17, 2007| url=http://www.fws.gov/refuges/profiles/index.cfm?id=21670| title=Wichita Mountains Wildlife Refuge| archive-date=March 29, 2013| archive-url=https://web.archive.org/web/20130329072638/http://www.fws.gov/refuges/profiles/index.cfm?id=21670}}</ref>

Of Oklahoma's federally protected parks or recreational sites, the [[Chickasaw National Recreation Area]] is the largest, with {{Convert|9898.63|acre|km2}}.<ref>{{cite web |publisher=National Park Service| access-date=January 16, 2010 | url=http://www.nps.gov/chic/parkmgmt/statistics.htm| title=Chickasaw National Recreation Area—Park Statistics}}</ref> Other sites include the [[Santa Fe Trail|Santa Fe]] and [[Trail of Tears]] national historic trails, the [[Fort Smith National Historic Site|Fort Smith]] and [[Washita Battlefield National Historic Site|Washita Battlefield]] national historic sites, and the [[Oklahoma City National Memorial]].<ref name="Oklahoma national parks"/>