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Select a state for access to Level III and IV maps, GIS data, and descriptive information. Last updated on January 2, 2024. Information and links to downloadable maps and datasets for Level III and IV ecoregions, listed by state.
Information and downloadable maps and datasets for ecoregions, which are areas of general similarity in the type, quality, and quantity of environmental resources.
Information and downloadable maps and datasets for Level III and IV ecoregions, listed by EPA region. Ecoregions are areas of general similarity in the type, quality, and quantity of environmental resources.
Information and downloadable maps and datasets for ecoregions of North America, which are areas of general similarity in the type, quality, and quantity of environmental resources.
Downloadable maps and datasets for Level III and IV ecoregions, listed by region. Ecoregions are areas of general similarity in the type, quality, and quantity of environmental resources.
Information and downloadable maps and datasets for Level III and IV ecoregions of the continental United States. Ecoregions are areas of general similarity in the type, quality, and quantity of environmental resources.
Downloadable maps and datasets for Level III and IV ecoregions, listed by state. Ecoregions are areas of general similarity in the type, quality, and quantity of environmental resources.
Ecoregions are identified by analyzing the patterns and composition of biotic and abiotic phenomena that affect or reflect differences in ecosystem quality and integrity (Omernik 1987, 1995). These phenomena include geology, landforms, soils, vegetation, climate, land use, wildlife, and hydrology.
These ecoregions have been used to develop regional biological criteria and water quality standards, set management goals for nonpoint source pollution, assess land cover trends, report on ecosystem carbon sequestration, and frame wildlife conservation research, among other applications.
Information and downloadable maps and datasets for Level III and IV ecoregions of the continental United States. Ecoregions are areas of general similarity in the type, quality, and quantity of environmental resources.