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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.
Date/Time Thumbnail Dimensions User Comment; current: 14:22, 2 September 2022: 6,652 × 5,260 (2.48 MB): TimK MSI {{Information |Description=Map of Level IV ecoregions in the U.S. state of Colorado, as defined by the United States Environmental Protection Agency.
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.
File:Level IV ecoregions, Coast Range.png licensed with PD-USGov 2008-06-16T01:58:14Z Northwest-historian 631x1945 (767496 Bytes) {{Information |Description={{en|1=Level IV ecoregions in the Coast Range ecoregion, as defined by the EPA. This map is a draft and may now be slightly outdated.
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The North American Commission for Environmental Cooperation (CEC), publishes ecoregions for the entire North American continent with the following arrangement: Level III: Ridge and Valley (Ecoregion 8.4.1). This ecoregion correlates with the EPA/USGS/USDA Level III Ecoregion 67. [4] Level II: Ozark, Ouachita-Appalachian Forests (Ecoregion 8.4).
"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.
File:Map of Southern Plains US ecoregion, Level IV ecoregions in EPA Region 4.jpg. ... USEPA Level IV ecoregions of Southern Coastal Plains, labelled 75, shaded green ...