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Level IV ecoregions (denoted by numbers and letters) are a further subdivision of Level III ecoregions (denoted by numbers alone). [ 2 ] [ 3 ] In general, Illinois transitions from the forests, to savannah , to tall grass prairie , and is now largely used for agriculture or urbanized, although in its far south are the forested highlands of the ...
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.
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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.
"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.
List of ecoregions in the United States (EPA) Ecoregions of the world defined by the conservation group World Wildlife Fund (WWF) : Global 200 ecoregions (WWF), 238 single or combined ecoregions identified by the World Wildlife Fund (WWF) as priorities for conservation. List of terrestrial ecoregions (WWF) 867 terrestrial ecoregions.
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 This map is a draft and may now be slightly outdated.
Full map of Level IV ecoregions in the Pacific Northwest This PNG image has a thumbnail version at File: Level IV ecoregions, Cascades.gif . Generally, the thumbnail version should be used when displaying the file from Commons, in order to reduce the file size of thumbnail images.