Lists of ecoregions in the United States may refer to:
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List of ecoregions in the United States (EPA)
This list 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, Mex ...
, United States Environmental Protection Agency system
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List of ecoregions in the United States (WWF)
The following is a list of United States ecoregions 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.
Terrestrial ecoregions
The ...
, World Wildlife Fund system
{{list of lists, environment
Ecoregions
An ecoregion (ecological region) is an ecology, ecological and Geography, geographic area that exists on multiple different levels, defined by type, quality, and quantity of environmental resources. Ecoregions cover relatively large areas of la ...