Keywords: Level IV ecoregions, North Cascades.PNG en Level IV ecoregions in the Northern Cascades ecoregion as defined by the EPA This map is a draft and may now be slightly outdated For more information about these ecoregions see http //www epa gov/wed/pages/ecoregions htm Modified from US EPA map at ftp //ftp epa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 Ecoregions Maps of EPA ecoregions PD-USGov |