Ecoregion
A large area of land or water that contains a geographically distinct assemblage of natural communities that(a) share a large majority of their species and ecological dynamics;(b) share similar environmental conditions, and;(c) interact ecologically in ways that are critical for their long-term persistence.--World Wide Fund for Nature - EcoregionsThe Global 200 is the list of ecoregions identified by the World Wide Fund for Nature (WWF) as priorities for conservation.