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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 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. For an example of Level IV data, see List of ecoregions in ...
File:Map of Southern Plains US ecoregion, Level IV ecoregions in EPA Region 4.jpg. Add languages. ... USEPA Level IV ecoregions of Southern Coastal Plains, labelled ...
Level III subdivides the continent into 182 ecoregions; of these, 9 lay partly within Oregon's borders. Level IV is a further subdivision of Level III ecoregions. There are 65 Level IV ecoregions in Oregon, [3] many of which continue into adjacent areas in the neighboring states of Washington, Idaho, Nevada, and California.
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 This map is a draft and may now be slightly outdated.
English: Level IV ecoregions in the Cascades ecoregion, as defined by the EPA. This map is a draft and may now be slightly outdated. This map is a draft and may now be slightly outdated. For more information about these ecoregions, see [1]
The North American Southeastern Plains are a Level III ecoregion designated by the Environmental Protection Agency (EPA) in ten U.S. states. The region takes a U shape starting in western Tennessee, going south through eastern Mississippi, and forming most of Alabama.