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In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology, physiography, vegetation, climate, soils, land use, wildlife distributions, and hydrology.
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.
This page was last edited on 31 January 2025, at 17:46 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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.
The task of defining and mapping these ecoregions was carried out by the Oregon Ecoregion Project, a collaborative effort involving the EPA, the United States Geological Survey (USGS), the United States Forest Service (USFS), and other state and federal agencies. The new classification system they developed may differ from previous frameworks ...
S. Sagebrush steppe; Sierra Madre Occidental pine–oak forests; Sierra Madre Oriental pine–oak forests; Snake River Plain (ecoregion) Snake–Columbia shrub steppe
"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 Oregon and the associated articles.
Lists of ecoregions in the United States may refer to: List of ecoregions in the United States (EPA) , United States Environmental Protection Agency system List of ecoregions in the United States (WWF) , World Wildlife Fund system