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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 ...
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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.
This image is a derivative work of the following images: File:Level IV ecoregions, Cascades.png licensed with PD-USGov . 2008-06-16T02:02:26Z Northwest-historian 544x1654 (769603 Bytes) {{Information |Description={{en|1=Level IV ecoregions in the Cascades ecoregion, as defined by the EPA.
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"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.
Pages in category "Ecoregions of Illinois" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. *