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Three level I areas were not subdivided for level 2. [2] Level III subdivides the continent into 182 smaller ecoregions; of these, 104 lie partly or wholly with the United States. [1] [3] Level IV is a further subdivision of Level III ecoregions. Level IV mapping is still underway but is complete across most of the United States.
"Level I" divides North America into 15 broad ecoregions. "Level II" subdivides the continent into 52 smaller ecoregions. "Level III" subdivides those regions again into 182 ecoregions. [1] [2] "Level IV" is a further subdivision of Level III ecoregions. Level IV mapping is still underway but is complete across most of the United States.
Ecoregions of North America, featuring the 50 United States, the District of Columbia and the five inhabited territories. The following is a list of ecoregions in the United States as identified by the World Wide Fund for Nature (WWF). The United States is a megadiverse country with a high level of endemism across a wide variety of ecosystems.
Date/Time Thumbnail Dimensions User Comment; current: 16:41, 22 July 2019: 5,100 × 6,300 (2.34 MB): TimK MSI {{Information |description ={{en|1=Map of Level III and Level IV ecoregions in the Delaware, Maryland, Pennsylvania, Virginia, Washington, D.C. and West Virginia, as defined by the U.S. Environmental Protection Agency.
Lists of ecoregions in the United States may refer to: List of ecoregions in the United States (EPA) , United States Environmental Protection Agency system List of ecoregions in the United States (WWF) , World Wildlife Fund system
Temperate broadleaf and mixed forests in the United States (1 C, 38 P) Temperate coniferous forests of the United States (1 C, 31 P) Temperate grasslands, savannas, and shrublands in the United States (2 C, 25 P)
Added the remaining four U.S. territories and added two missing ecoregions on the mainland, per WWF definitions. Renumbered each ecoregion based upon their biogeographic realms (Nearctic first, then Neotropical and Oceanian) and biomes. Changed colours of a couple ecoregions. 08:38, 20 November 2020: 1,712 × 1,992 (1.17 MB) Ponderosapine210
The ecoregion covers approximately 84,500 km2 (32,630 mi2). [2] It is about 72 percent forest and 23 percent agriculture. Coal mining is still active in the Pennsylvania, West Virginia, and Kentucky portions of the ecoregion, and in Appalachian Ohio to a lesser extent.