Keywords: Level IV ecoregions, Northern Basin and Range.png Basin and Range ecoregion as defined by the EPA This map is a draft and may now be slightly outdated For more information about these ecoregions see http //www epa gov/wed/pages/ecoregions htm epa gov/ecoregions Modified from US EPA map at ftp //ftp epa gov/wed/ecoregions/or_wa_id/pnw_map pdf US Environmental Protection Agency thumb 500px left Full map of Level IV ecoregions in the Pacific Northwest draft PD-USGov Basin and Range Province Ecoregions Maps of EPA ecoregions Geography of Northwestern United States |