Ecoregions of North America

Ecoregions are areas where ecosystems (and the type, quality, and quantity of environmental resources) are generally similar. This ecoregion framework is derived from Omernik (1987) and from mapping done in collaboration with EPA regional offices, other Federal agencies, state resource management agencies, and neighboring North American countries. Designed to serve as a spatial framework for the research, assessment, and monitoring of ecosystems and ecosystem components, ecoregions denote areas of similarity in the mosaic of biotic, abiotic, terrestrial, and aquatic ecosystem components with humans being considered as part of the biota. These regions are critical for structuring and implementing ecosystem management strategies across Federal agencies, state agencies, and nongovernmental organizations that are responsible for different types of resources within the same geographic areas.

Ecoregions are identified by analyzing the patterns and composition of biotic and abiotic phenomena that affect or reflect differences in ecosystem quality and integrity. These phenomena include geology, landforms, soils, vegetation, climate, land use, wildlife, and hydrology. The relative importance of each characteristic varies from one ecological region to another regardless of the hierarchical level. A Roman numeral classification scheme has been adopted for different hierarchical levels of ecoregions, ranging from general regions to more detailed.

North America has been divided into:

15 broad, level I ecological regions;
50 level II ecological regions intended to provide a more detailed description of the large ecological areas nested within the level I regions; and
182 Level III ecoregions, which are smaller ecological areas nested within level II regions.

Select a section for additional details about each level, or a list of links to downloadable maps and GIS data files.

See all >>

Index of /EPADataCommons/ORD/Ecoregions/html
FTP directory of Ecoregion files

Explore Data

Field	Value
Tags	ecoregions ecosystem Environment landforms Soil vegetation climate land use wildlife hydrology
Modified	2022-01-10
Release Date	2018-04-13
Identifier	f8c728de-d3ad-4295-b5dc-da28adde20f4
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Publisher	Environmental Protection Agency
License	U.S. Public Domain
Contact Name	Ferster, Aaron
Contact Email	ferster.aaron@epa.gov
Public Access Level	Public

Extended Metadata:

Field	Value
Authors	Environmental Protection Agency
Peer Reviewed	No
Funding Sources	U.S. Environmental Protection Agency
Product Type	Dataset
Related Content	Ecoregions of North America EcoRegions background Level III and IV Ecoregions by State Level III and IV Ecoregions by EPA Region

Field	Value
ISO Topic(s)	boundaries environment geoscientificInformation imageryBaseMapsEarthCover
State or Territory	United States Of America
National Agricultural Library Thesaurus Term	ecoregions resource management monitoring aquatic ecosystems humans ecosystem management nongovernmental organizations geology landforms soil vegetation climate land use wildlife hydrology North America geographic information systems
Ag Data Commons Keywords	Maps & Multimedia Maps & Multimedia GIS Data and Images Agroecosystems & Environment

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