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An ecoregion denotes an area that contains generally similar ecosystems. Ecoregions are defined by patterns and composition of biotic and abiotic phenomena such as geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology. Level III ecoregions delineate similar ecosystems at a regional perspective and are subdivisions of level II (national/regional perspective) and Level I (continental perspective) ecoregions. The data within this layer was derived from the U.S. EPA 2003 dataset. Metadata
http://oe.oregonexplorer.info/metadata/EcoregionLevel3_2008.htm
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http://oregonexplorer.info/ExternalContent/SpatialDataForDownload/ORE_epa_ecoregions.zip |