List of ecoregions (WWF)

The World Wildlife Fund (WWF) identifies terrestrial, marine, freshwater, and ecoregions:
 * Global 200
 * List of terrestrial ecoregions (WWF) 867 terrestrial ecoregions.
 * List of marine ecoregions (WWF), 232 marine ecoregions of the coastal and continental shelf areas.
 * List of freshwater ecoregions (WWF), 426 freshwater ecoregions.