Lists of ecoregions

Wikipedia has articles relating to several ecoregion classification systems, defined by the conservation group World Wildlife Fund (WWF), the Commission for Environmental Cooperation (CEC), and like agencies around the world.

The WWF uses three main classifications: Biogeographic realms (also called ecozones), biomes (also called major habitat types), and ecoregions.

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Terrestrial Ecoregions of the World (Olson et al. 2001, BioScience)

WWF terrestrial ecoregions of the world

One way of mapping the world into 18 terrestrial vegetation biomes, each containing one or more ecoregions

EPA level III ecoregions in the contiguous United States. Alaska ecoregions (102-120) not shown.

Ecoregions of North America, featuring the 50 United States , the District of Columbia and the five inhabited territories