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Ecoregions are based on perceived patterns of a combination of causal and integrative factors including land use, land surface form, potential natural vegetation, and soils (Omernik, 1987).
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Ecoregions of the United States of America: Ecoregional planning units are designed as a basis for comprehensive ecosystem planning.
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This multi-tiered, broad-scale, hierarchical system of ecoregions is based on numerous environmental variables at each level. The first two tiers are based on climate, followed by climate and physiograpghy, and finally topography and soils. This data was used to provide a general description of the ecosystem geography.


    map background search result map search result map Bailey's Ecoregions of the Conterminous United States Aquatic Ecoregions of the Conterminous United States The Nature Conservancy's Ecoregions of the United States Kentucky - Tier 1 Conservation Areas Kentucky - Tier 1 Conservation Areas The Nature Conservancy's Ecoregions of the United States Aquatic Ecoregions of the Conterminous United States Bailey's Ecoregions of the Conterminous United States