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- List_of_ecoregions_in_the_United_States_(EPA) abstract "This list of ecoregions in the United States provides an overview of United States ecoregions designated by the U.S. Environmental Protection Agency (EPA) and the Commission for Environmental Cooperation (CEC). The CEC was established in 1994 by the member states of Canada, Mexico, and the United States to address regional environmental concerns under the North American Agreement on Environmental Cooperation (NAAEC), the environmental side accord to the North American Free Trade Agreement (NAFTA). The Commission's 1997 report, Ecological Regions of North America, provides a framework that may be used by government agencies, non-governmental organizations, and academic researchers as a basis for risk analysis, resource management, and environmental study of the continent's ecosystems. 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.The classification system has four levels, but only Levels I and III are shown on this list. Level I divides North America into 15 broad ecoregions; of these, 12 lay partly or wholly within the United States. Level III subdivides the continent into 182 smaller ecoregions; of these, 104 lay partly or wholly with the United States. 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. The classification system excludes the U.S. state of Hawaii, which is not part of the North American mainland.".
- List_of_ecoregions_in_the_United_States_(EPA) thumbnail Level_III_ecoregions,_United_States.png?width=300.
- List_of_ecoregions_in_the_United_States_(EPA) wikiPageExternalLink cropmap.
- List_of_ecoregions_in_the_United_States_(EPA) wikiPageID "17964555".
- List_of_ecoregions_in_the_United_States_(EPA) wikiPageRevisionID "606133480".
- List_of_ecoregions_in_the_United_States_(EPA) hasPhotoCollection List_of_ecoregions_in_the_United_States_(EPA).
- List_of_ecoregions_in_the_United_States_(EPA) subject Category:Ecoregions_of_North_America.
- List_of_ecoregions_in_the_United_States_(EPA) subject Category:Ecoregions_of_the_United_States.
- List_of_ecoregions_in_the_United_States_(EPA) subject Category:Lists_of_ecoregions_by_country.
- List_of_ecoregions_in_the_United_States_(EPA) subject Category:Natural_history_of_the_United_States.
- List_of_ecoregions_in_the_United_States_(EPA) subject Category:United_States_geography-related_lists.
- List_of_ecoregions_in_the_United_States_(EPA) subject Category:United_States_science-related_lists.
- List_of_ecoregions_in_the_United_States_(EPA) comment "This list of ecoregions in the United States provides an overview of United States ecoregions designated by the U.S. Environmental Protection Agency (EPA) and the Commission for Environmental Cooperation (CEC).".
- List_of_ecoregions_in_the_United_States_(EPA) label "List of ecoregions in the United States (EPA)".
- List_of_ecoregions_in_the_United_States_(EPA) sameAs Q6617850.
- List_of_ecoregions_in_the_United_States_(EPA) sameAs Q6617850.
- List_of_ecoregions_in_the_United_States_(EPA) wasDerivedFrom List_of_ecoregions_in_the_United_States_(EPA)?oldid=606133480.
- List_of_ecoregions_in_the_United_States_(EPA) depiction Level_III_ecoregions,_United_States.png.
- List_of_ecoregions_in_the_United_States_(EPA) isPrimaryTopicOf List_of_ecoregions_in_the_United_States_(EPA).
