Ecoregion

From Oklahoma

cnaletosit An Ecoregion is an Ecological Region where ecosystems are generally similar. The EPA defines ecoregions at 4 different levels of coarseness, 1 being the most general and 4 being most precise. Regions are defined by "biotic and abiotic phenomena that affect or reflect differences in ecosystem quality and integrity". Efforts to define ecosystems of the US with level 4 precision are not yet complete.