Ecoregions

115 WWF terrestrial ecoregions

Biodiversity Heatmap

Species count by biogeographic realm and taxonomic class

Realm	Acidimicrobiia	Acidobacteriae	Aconoidasida	Actinomycetia	Actinopterygii	Aenigmatarchaeia	Agaricomycetes	Alphaproteobacteria
Afrotropic	—	—	1	—	—	—	1	—
Australasia	—	—	—	—	1	—	—	—
Indomalaya	—	—	—	—	1	—	1	—
Nearctic	—	—	—	—	—	—	—	—
Neotropic	—	—	—	—	—	—	1	—
Oceania	—	—	—	—	1	—	—	—
Palearctic	—	—	—	—	1	—	1	—
Antarctic	—	—	—	—	—	—	—	—

Low

High

Boreal Forests / Taiga (15)

Alaska Peninsula montane taiga

Nearctic 48877 km²

Central Canadian Shield forests

Nearctic 271655 km²

Cook Inlet taiga

Nearctic 28042 km²

Copper Plateau taiga

Nearctic 17257 km²

Eastern Canadian forests

Nearctic 465732 km²

Eastern Canadian Shield taiga

Nearctic 757987 km²

Interior Alaska-Yukon lowland taiga

Nearctic 426276 km²

Northern Canadian Shield taiga

Nearctic 632841 km²

Northern Cordillera forests

Nearctic 169391 km²

Northwest Territories taiga

Nearctic 334352 km²

Southern Hudson Bay taiga

Nearctic 373301 km²

Mid-Canada Boreal Plains forests

Nearctic 569720 km²

Midwest Canadian Shield forests

Nearctic 757040 km²

Muskwa-Slave Lake taiga

Nearctic 298907 km²

Watson Highlands taiga

Nearctic 239104 km²

Deserts & Xeric Shrublands (13)

Baja California desert

Nearctic 77590 km²

Central Mexican matorral

Nearctic 59195 km²

Chihuahuan desert

Nearctic 501897 km²

Colorado Plateau shrublands

Nearctic 283435 km²

Great Basin shrub steppe

Nearctic 300878 km²

Gulf of California xeric scrub

Nearctic 23537 km²

Meseta Central matorral

Nearctic 124975 km²

Mojave desert

Nearctic 127338 km²

Snake-Columbia shrub steppe

Nearctic 193188 km²

Sonoran desert

Nearctic 224486 km²

Tamaulipan matorral

Nearctic 16237 km²

Tamaulipan mezquital

Nearctic 125091 km²

Wyoming Basin shrub steppe

Nearctic 132682 km²

Mediterranean Forests, Woodlands & Scrub (4)

California coastal sage and chaparral

Nearctic 32878 km²

California interior chaparral and woodlands

Nearctic 71971 km²

California montane chaparral and woodlands

Nearctic 19840 km²

Santa Lucia Montane Chaparral & Woodlands

Nearctic 4708 km²

Temperate Broadleaf & Mixed Forests (17)

Allegheny Highlands forests

Nearctic 73238 km²

Appalachian mixed mesophytic forests

Nearctic 181485 km²

Appalachian-Blue Ridge forests

Nearctic 163311 km²

East Central Texas forests

Nearctic 55753 km²

Eastern Great Lakes lowland forests

Nearctic 129943 km²

Gulf of St. Lawrence lowland forests

Nearctic 36257 km²

Mississippi lowland forests

Nearctic 116119 km²

New England-Acadian forests

Nearctic 334383 km²

Ozark Mountain forests

Nearctic 69495 km²

Southern Great Lakes forests

Nearctic 227945 km²

Western Great Lakes forests

Nearctic 290091 km²

Appalachian Piedmont forests

Nearctic 166117 km²

Eastern Canadian Forest-Boreal transition

Nearctic 318861 km²

Interior Plateau US Hardwood Forests

Nearctic 123527 km²

Northeast US Coastal forests

Nearctic 73433 km²

Ozark Highlands mixed forests

Nearctic 106391 km²

Upper Midwest US forest-savanna transition

Nearctic 136417 km²

Temperate Coniferous Forests (24)

Alberta-British Columbia foothills forests

Nearctic 121629 km²

Arizona Mountains forests

Nearctic 110910 km²

Atlantic coastal pine barrens

Nearctic 14308 km²

Blue Mountains forests

Nearctic 70911 km²

Central British Columbia Mountain forests

Nearctic 140060 km²

Colorado Rockies forests

Nearctic 145702 km²

Eastern Cascades forests

Nearctic 53257 km²

Great Basin montane forests

Nearctic 8901 km²

Klamath-Siskiyou forests

Nearctic 48358 km²

Northern California coastal forests

Nearctic 13593 km²

Okanogan dry forests

Nearctic 52636 km²

Puget lowland forests

Nearctic 36181 km²

Sierra Nevada forests

Nearctic 53103 km²

South Central Rockies forests

Nearctic 176757 km²

Wasatch and Uinta montane forests

Nearctic 45693 km²

British Columbia coastal conifer forests

Nearctic 110921 km²

Central Pacific Northwest coastal forests

Nearctic 77510 km²

Central-Southern Cascades Forests

Nearctic 58854 km²

Fraser Plateau and Basin conifer forests

Nearctic 104685 km²

North Cascades conifer forests

Nearctic 35270 km²

Northern Pacific Alaskan coastal forests

Nearctic 64304 km²

Northern Rockies conifer forests

Nearctic 284264 km²

Piney Woods

Nearctic 152132 km²

Queen Charlotte Islands conifer forests

Nearctic 10241 km²

Temperate Grasslands, Savannas & Shrublands (19)

California Central Valley grasslands

Nearctic 46490 km²

Canadian Aspen forests and parklands

Nearctic 327663 km²

Edwards Plateau savanna

Nearctic 74964 km²

Montana Valley and Foothill grasslands

Nearctic 100079 km²

Nebraska Sand Hills mixed grasslands

Nearctic 59123 km²

Texas blackland prairies

Nearctic 43382 km²

Central US forest-grasslands transition

Nearctic 228324 km²

Central Tallgrass prairie

Nearctic 342467 km²

Central-Southern US mixed grasslands

Nearctic 274963 km²

Cross-Timbers savanna-woodland

Nearctic 88188 km²

Flint Hills tallgrass prairie

Nearctic 27932 km²

Mid-Atlantic US coastal savannas

Nearctic 78476 km²

Northern Shortgrass prairie

Nearctic 719348 km²

Northern Tallgrass prairie

Nearctic 82919 km²

Palouse prairie

Nearctic 83923 km²

Southeast US conifer savannas

Nearctic 521305 km²

Southeast US mixed woodlands and savannas

Nearctic 28 km²

Western shortgrass prairie

Nearctic 487149 km²

Willamette Valley oak savanna

Nearctic 14885 km²

Tropical & Subtropical Coniferous Forests (3)

Bermuda subtropical conifer forests

Nearctic 39 km²

Sierra Madre Occidental pine-oak forests

Nearctic 216445 km²

Sierra Madre Oriental pine-oak forests

Nearctic 65192 km²

Tropical & Subtropical Dry Broadleaf Forests (1)

Sonoran-Sinaloan subtropical dry forest

Nearctic 50903 km²

Tropical & Subtropical Grasslands, Savannas & Shrublands (1)

Western Gulf coastal grasslands

Nearctic 90735 km²

Tundra (18)

Alaska-St. Elias Range tundra

Nearctic 165303 km²

Aleutian Islands tundra

Nearctic 12279 km²

Arctic coastal tundra

Nearctic 50041 km²

Arctic foothills tundra

Nearctic 130337 km²

Beringia lowland tundra

Nearctic 153512 km²

Beringia upland tundra

Nearctic 47229 km²

Brooks-British Range tundra

Nearctic 160610 km²

Davis Highlands tundra

Nearctic 98542 km²

Interior Yukon-Alaska alpine tundra

Nearctic 153588 km²

Kalaallit Nunaat High Arctic tundra

Nearctic 149284 km²

Ogilvie-MacKenzie alpine tundra

Nearctic 302981 km²

Pacific Coastal Mountain icefields and tundra

Nearctic 106663 km²

Torngat Mountain tundra

Nearctic 32767 km²

Ahklun and Kilbuck Upland Tundra

Nearctic 50824 km²

Canadian High Arctic tundra

Nearctic 649702 km²

Canadian Low Arctic tundra

Nearctic 840832 km²

Canadian Middle Arctic Tundra

Nearctic 985868 km²

Kalaallit Nunaat Arctic steppe

Nearctic 329027 km²