List of ecoregions in the United States (WWF)

Ecoregions of North America, featuring the 50 United States, the District of Columbia and the 5 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.

Terrestrial ecoregions

The United States is unique among countries in that its terrestrial ecoregions span three biogeographic realms: the Nearctic, Neotropical, and Oceanian realms.

50 states

Alaska is the most biodiverse state with 15 ecoregions across 3 biomes in the same realm. California comes in a close second with 13 ecoregions across 4 biomes in the same realm. By contrast, Rhode Island is the least biodiverse with just one ecoregion - the Northeastern coastal forests - encompassing the entire state.^[1]

The terrestrial ecoregions of the 50 states of the United States are as follows:

5 inhabited territories

The ecoregions of the 5 inhabited territories of the United States are as follows:

Marine ecoregions

The marine ecoregions of the 50 states of the United States are as follows:

See also

• Alternative classification framework
  • List of ecoregions in the United States (EPA)
• WWF ecoregions of neighboring countries
  • List of ecoregions in Canada (WWF)
  • List of ecoregions in Mexico (WWF)

References

1. "The Atlas of Global Conservation". maps.tnc.org. Retrieved 2020-11-18.

• Ricketts, Taylor H; Eric Dinerstein; David M. Olson; Colby J. Loucks; et al. (1999). Terrestrial Ecoregions of North America: a Conservation Assessment. Island Press; Washington, DC.