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Level III Ecoregions of Oregon

Revised April 2000
National Health and Environmental Effects Research Laboratory
U.S. Environmental Protection Agency

level III ecoregions of Oregon region 01   1. Coast Range
region 03   3. Willamette Valley
region 04   4. Cascades
region 09   9. Eastern Cascades Slopes and Foothills
region 10   10. Columbia Plateau
region 11   11. Blue Mountains
region 12   12. Snake River Basin
region 13   13. Central Basin and Range
region 78   78. Klamath Mountains
region 80   80. Northern Basin and Range