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Level III Ecoregions of Oklahoma

Revised April 2000
National Health and Environmental Effects Research Laboratory
U.S. Environmental Protection Agency

level III ecoregions of Oklahoma region 25   25. Western High Plains
region 26   26. Southwestern Tablelands
region 27   27. Central Great Plains
region 28   28. Flint Hills
region 29   29. Central Oklahoma/Texas Plains
region 35   35. South Central Plains
region 36   36. Ouachita Mountains
region 37   37. Arkansas Valley
region 38   38. Boston Mountains
region 39   39. Ozark Mountains
region 40   40. Central Irregular Plains