List of ecoregions in the United States (EPA): Wikis


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This list of ecoregions in the United States provides an overview of United States ecoregions designated by the U.S. Environmental Protection Agency (EPA) and the Commission for Environmental Cooperation (CEC). The CEC was established in 1994 by the member states of Canada, Mexico, and the United States to address regional environmental concerns under the North American Agreement on Environmental Cooperation (NAAEC), the environmental side accord to the North American Free Trade Agreement (NAFTA). The Commission's 1997 report, Ecological Regions of North America, provides a framework that may be used by government agencies, non-governmental organizations, and academic researchers as a basis for risk analysis, resource management, and environmental study of the continent's ecosystems.[1] In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology, physiography, vegetation, climate, soils, land use, wildlife distributions, and hydrology.

The classification system has four levels, but only Levels I and III are shown on this list. Level I divides North America into 15 broad ecoregions; of these, 12 lay partly or wholly within the United States. Level III subdivides the continent into 182 smaller ecoregions; of these, 104 lay partly or wholly with the United States.[1][2] Level IV is a further subdivision of Level III ecoregions. Level IV mapping is still underway but is complete across most of the United States. For an example of Level IV data, see List of ecoregions in Oregon and the associated articles. The classification system excludes the U.S. state of Hawaii, which is not part of the North American mainland.


Ecoregions in the United States

Level III ecoregions in the contiguous United States. Alaska ecoregions (102-120) not shown.

Marine West Coast Forest

  • 1 Coast Range
  • 2 Puget Lowland
  • 3 Willamette Valley
  • Ahklun Mountains and Kilbuck Mountains (ecoregion)|111 Ahklun and Kilbuck Mountains
  • 113 Alaska Peninsula Mountains
  • 115 Cook Inlet
  • 119 Pacific Coastal Mountains
  • 120 Coastal Western Hemlock-Sitka Spruce Forests

The corresponding CEC ecoregion in Canada is called the Pacific Maritime Ecozone.

Northwestern Forested Mountains

The corresponding CEC ecoregion in Canada is called the Montane Cordillera Ecozone.

Mediterranean California

North American Deserts

Temperate Sierras

  • 23 Arizona/New Mexico Mountains

Great Plains

The corresponding name in Canada for the same ecoregion is the Prairies Ecozone.

Eastern Temperate Forest

  • 32 Texas Blackland Prairies
  • 33 East Central Texas Plains
  • 35 South Central Plains
  • 36 Ouachita Mountains
  • 37 Arkansas Valley
  • 38 Boston Mountains
  • 39 Ozark Highlands
  • 45 Piedmont
  • 51 North Central Hardwood Forests
  • 52 Driftless Area
  • 53 Southeastern Wisconsin Till Plains
  • 54 Central Corn Belt Plains
  • 55 Eastern Corn Belt Plains
  • 56 Southern Michigan/Northern Indiana Drift Plains
  • 57 Huron/Erie Lake Plains
  • 59 Northeastern Coastal Zone
  • 60 Northern Appalachian Plateau and Uplands
  • 61 Erie Drift Plain
  • 63 Middle Atlantic Coastal Plain
  • 64 Northern Piedmont
  • 65 Southeastern Plains
  • 66 Blue Ridge
  • 67 Ridge and Valley
  • 68 Southwestern Appalachians
  • 69 Central Appalachians
  • 70 Western Allegheny Plateau
  • 71 Interior Plateau
  • 72 Interior River Valleys and Hills
  • 73 Mississippi Alluvial Plain
  • 74 Mississippi Valley Loess Plains
  • 75 Southern Coastal Plain
  • 82 Laurentian Plains and Hills
  • 83 Eastern Great Lakes and Hudson Lowlands
  • 84 Atlantic Coastal Pine Barrens

The corresponding ecoregion in Canada is named the Mixedwood Plains Ecozone.

Northern Forests

  • 49 Northern Minnesota Wetlands
  • 50 Northern Lakes and Forests
  • 58 Northeastern Highlands
  • 62 North Central Appalachians

The corresponding name in Canada for the same ecoregions are the Boreal Shield and the Atlantic Maritime Ecozones.

Tropical Wet Forests

  • 76 Southern Florida Coastal Plain

Southern Semi-Arid Highlands


  • 101 Arctic Coastal Plain
  • 102 Arctic Foothills
  • 103 Brooks Range
  • 104 Interior Forested Lowlands and Uplands
  • 106 Interior Bottomlands
  • 107 Yukon Flats
  • 108 Ogilvie Mountains


  • 109 Subarctic Coastal Plains
  • 110 Seward Peninsula
  • 112 Bristol Bay-Nushagak Lowlands
  • 114 Aleutian Islands

Listings by state

See also



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