Ecoregions
The EPA, in collaboration with other agencies, developed a framework to identify and map areas where ecosystems, including their types, quality, and quantities of environmental resources, are generally similar. These regions play a key role in organizing and applying ecosystem management strategies.
In the continental U.S., there are three levels of ecoregions, and one additional level specific to the contiguous U.S.,
Level I – Broad ecological regions across North America
Level II – More detailed descriptions of the larger ecological regions in North America
Level III – Smaller ecological areas within the Level II regions of North America
Level IV – More specific ecoregions within the contiguous U.S.
The EPA's Ecoregions of North America provides detailed information about ecological regions (ecoregions) across the continent.
Oregon Ecoregions
The Oregon Conservation Strategy website provides specific information on primary conservation issues for each of Oregon’s nine Ecoregions
PDF Maps for North American Ecoregions
Level I Ecoregions of North America: Full size map
Level II Ecoregions of North America: Full size map
Level III Ecoregions of North America: Full size map
GIS data for North American Ecoregions
Including shapefiles, metadata and symbology. View instructions for applying symbology to ecoregions.
Level I
Level II
Level III
Additional Information on Ecoregions
See maps, GIS data, and descriptive information for Level III and IV Ecoregions by State