Ecoregions of the United States

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Ecoregions Map
100 Polar Domain

120 Tundra Division

    124 Arctic Tundra Province
    125 Bering Tundra (Norther) Province
    126 Bering Tundra (Southern) Province
M120 Tundra Regime Mountains
    M121 Brooks Range Tundra - Polar Desert Province
    M125 Sewared Peninsula Tundra - Meadow Province
    M126 Bering Ahklun Mountains Tundra - Meadow Province
    M127 Aleutian Oceanic Meadow - Health Province
M130 Subarctic Division
    M131 Yukon Intermontane Plateaus Tayga Province
    M135 Coastal Trough Humid Tayga - Tundra
    M139 Upper Yukon Tayga Province
M130 Subarctic Regime Mountains
    M131 Yukon Intermontane Plateaus Tayga -Meadow Province
    M135 Alaska Range Humid Tayga- Tundra - Meadow Province
    M139 Upper Yukon Tayga - Meadow Province
200 Humid Temperate Domain

210 Warm Continental Division

    212 Laurentian Mixed Power Forest Province
M210 Warm Continental Regime Mountains
    M212 Adirondack - New England Mixed Forest - Coniferous Forest - Alpine Meadow Province
220 Hot Continental Division
    221 Eastern Broadleaf Forest (Oceanic) Province
    222 Eastern Broadleaf Forest (Continental) Province
M220 Hot Continental Regime Mountains
    M221 Central Appalachian Broadleaf Forest- Coniferous Forest - Meadow Province
    M222 Ozark Broadleaf Forest - Meadow Province
230 Subtropical Division
    231 Southeastern Mixed Forest Province
    232 Outer Coastal Plain Mixed Forest Province
    234 Lower Mississippi Riverine Forest Province
M230 Subtropical Regime Mountains
    M231 Oachita Mixed Forest - Meadow Province
240 Marine Division
    242 Pacific Lowland Mixed Forest Province
M240 Marine Regime Mountains
    M242 Cascade Mixed Forest - Coniferous
    M244 Pacific Coastal Mountains Forest - Meadow Province
    M245 Pacific Gulf Coastal Forest - Meadow Province
250 Prairie Division
    251 Prairie Parkland (Temperate) Province
    255 Prairie Parkland (Subtropical) Province
260 Mediterranean Regime Mountains
    261 California Coastal Chaparral Forest and Shrub Province
    262 California Dry Steppe Province
    263 California Coastal Steppe, Mixed Forest, and Redwood Forest Province
M260 Mediterranean Regime Mountains
    M261 Sierran Steppe - Mixed Forest - Coniferous Forest -Alpine Meadow Province
    M262 California Coastal Range Open Woodland - Shrub - Coniferous Forest - Meadow Province
300 Dry Domain

310 Tropical/Subtropical Steppe Division

    311 Great Plains Steppe and Shrub Province
    313 Colorado Plateau Semi-Desert Province
    315 Southwest Plateau and Plains Dry Steppe and Shrub Province
M310 Tropical/Subtropical Steppe Regime Mountains
    M313 Arizona-New Mexico Mountains Semi-Desert -Open Woodland - Coniferous Forest -Alpine Meadow Province
320 Tropical/Subtropical Desert Division
    321 Chihuahuan Semi-Desert Province
    322 American Semi-Desert and Desert Province
M330 Temperate Steppe Division
    331 Great Plains-Palouse Dry Steppe Province
    332 Great Plains Steppe Province
M330 Temperate Steppe Division
    M331 Southern Rocky Mountains Steppe - Open Woodland - Coniferous Forest - Alpine Meadow Province
    M332 Middle Rocky Mountains Steppe - Coniferous Forest - Alpline Meadow Province
    M333 Northern Rocky Mountains Forest - Steppe - Coniferous - Forest - Alpine Meadow Province
    M334 Black Hills Coniferous Forest Province
340 Temperate Desert Division
    341 Intermountain Semi-Desert and Desert Province
    342 Intermountain Semi-Desert Province
M340 Temperate Desert Regime Mountains
    M341 Nevada - Utah Mountains Semi-Desert - Coniferous Forest - Alpine Meadow Province

400 Humid Tropical Domain

410 Savanna Division

    411 Everglades Province
M410 Savanna Regime Mountains
    M411 Puerto Rico Province
M420 Rainforest Regime Mountains
    M423 Hawaiian Islands Province
Source: R.G. Bailey [Ecoregions of the United States, USDA Forest Service (scale 1:7,500,000, revised 1994)]
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