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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.
Southern Limestone-Dolomite Valleys & Low Rolling Hills ecoregion (67f, medium-dark orange) coursing through the states of Virginia, Tennessee, Georgia and Alabama.. The Southern Limestone/Dolomite Valleys & Low Rolling Hills (Ecoregion 67f) is one of the 99 Level IV ecoregions in the continental United States, as defined by a collaboration between the EPA, USGS and USDA. [1]
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: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 ...
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.
"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.
Louisiana contains barrier islands and coastal lowlands, large river floodplains, rolling and hilly coastal plains with evergreen and deciduous forests, and a variety of aquatic habitats. There are 6 level III ecoregions and 28 level IV ecoregions, and most of these continue into ecologically similar parts of adjacent states. [1]
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.