Lists of ecoregions in the United States
Lists of ecoregions in the United States — based upon two separate ecoregion classification systems:
- List of ecoregions in the United States (EPA) — United States Environmental Protection Agency system.
- List of ecoregions in the United States (WWF) — World Wildlife Fund system.
See also
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| Marine West Coast Forest |
- 1 Coast Range
- 2 Puget Lowland
- 3 Willamette Valley
- 111 Ahklun and Kilbuck Mountains
- 113 Alaska Peninsula Mountains
- 115 Cook Inlet
- 119 Pacific Coastal Mountains
- 120 Coastal Western Hemlock-Sitka Spruce Forests
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| Northwestern Forested Mountains | |
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| Mediterranean California | |
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| North American Deserts | |
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| Temperate Sierras | |
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| Great Plains | |
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| Eastern Temperate Forest | |
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| Northern Forests |
- 49 Northern Minnesota Wetlands
- 50 Northern Lakes and Forests
- 58 Northeastern Highlands
- 62 North Central Appalachians
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| Tropical Wet Forests |
- 76 Southern Florida Coastal Plain
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| Southern Semi-Arid Highlands | |
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| Taiga |
- 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
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| Tundra |
- 109 Subarctic Coastal Plains
- 110 Seward Peninsula
- 112 Bristol Bay-Nushagak Lowlands
- 114 Aleutian Islands
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