Level III and IV Ecoregions of the Continental United States
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For additional details about each Ecoregion level, including links to downloadable maps and GIS data files, click on one of the gray bars below.
Level III Ecoregions
Level III Ecoregions Downloads
(NOTE: maps and GIS files may differ. To make sure you are using the most current ecoregion data, download shapefiles of ecoregions)
GIS data (shapefiles, metadata and symbology):
- US Level III Ecoregions shapefile with state boundaries (35 mb)
- US Level III Ecoregions shapefile without state boundaries (28 mb)
- US Level III Ecoregions Metadata and US Level III Ecoregions Symbology
- Instructions for applying symbology to ecoregions
Maps (PDF Format):
- US Level III Ecoregions--30" X 23" (PDF, 3.8 mb)
- US Level III Ecoregions with Hillshading--30" X 23" (PDF, 16 mb)
- US Level III Ecoregions with North America Hillshading--30" X 23" (PDF, 33.7 mb)
Ecoregion Descriptions (MSWord documents):
Level IV Ecoregions
(NOTE: maps and GIS files may differ. To make sure you are using the most current ecoregion data, download shapefiles of ecoregions)
GIS data (shapefiles, metadata and symbology):
- US Level IV Ecoregions shapefile with state boundaries (69 mb)
- US Level IV Ecoregions shapefile without state boundaries (65 mb)
- US Level IV Ecoregions Metadata and US Level IV Ecoregions Symbology
- Instructions for applying symbology to ecoregions
Maps (PDF Format):