List of ecoregions in the United States (WWF)

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.

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

• 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.

1. List of ecoregions in the United States (EPA)
2. List of terrestrial ecoregions (WWF)
3. List of ecoregions in Canada (WWF)
4. Lists of ecoregions in the United States
5. List of ecoregions in Mexico
6. Lists of ecoregions
7. List of ecoregions in Illinois
8. List of tundra ecoregions
9. List of ecoregions in Indiana
10. List of ecoregions in Wisconsin
11. Willamette Valley (ecoregion)
12. Ecoregion
13. Northern Tallgrass Prairie
14. Nearctic realm
15. The Wildlands Conservancy
16. Global 200
17. Northern Shortgrass Prairie
18. Columbia Plateau (ecoregion)
19. List of ecoregions in North America (CEC)
20. Boston Mountains