Appendix 3:
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Approximate area and proportionate extent of ecoregions at the
province level in the United States (area given to nearest 100
square miles and percent to nearest tenth.)
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Extent
in
Province Area U.S.
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Square
Miles Percent
124 Arctic Tundra 19,100 0.5
125 Bering Tundra (Northern) 46,900 1.3
126 Bering Tundra (Southern) 23,600 0.7
M121 Brooks Range 101,600 2.8
M125 Seward Peninsula 20,600 0.6
M126 Ahklun Mountains 16,700 0.5
M127 Aleutian 22,200 0.6
131 Yukon Plateaus Tayga 56,100 1.6
135 Coastal Trough Tayga 15,700 0.4
139 Upper Yukon Tayga 13,000 0.4
M131 Yukon Tayga--Meadow 55,000 1.5
M135 Alaska Range 61,000 1.7
M139 Upper Yukon Tayga--Meadow 68,400 1.9
212 Laurentian Mixed Forest 147,300 4.1
M212 Adirondack-New England 43,600 1.2
221 Eastern Broadleaf Forest
(Oceanic) 104,500 2.9
222 Eastern Broadleaf Forest
(Continental) 270,000 7.5
M221 Central Appalachian 68,100 1.9
M222 Ozark 6,400 0.2
231 Southeastern Mixed Forest 193,000 5.4
232 Outer Coastal Plain Mixed 173,800 4.8
Forest
234 Lower Mississippi Riverine 44,300 1.2
Forest
M231 Ouachita 8,800 0.2
242 Pacific Lowland Mixed Forest 14,900 0.4
M242 Cascade 53,400 1.5
M244 Pacific Coastal Mountains 40,000 1.1
M245 Pacific Gulf 23,900 0.7
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Extent
in
Province Area U.S.
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Square
Miles Percent
251 Prairie Parkland (Temperate) 218,200 6.1
255 Prairie Parkland (Subtropical) 80,100 2.2
261 California Coastal Chaparral 10,300 0.3
262 California Dry Steppe 19,200 0.5
263 California Coastal Steppe/ 4,600 0.1
Mixed Forest/Redwood Forest
M261 Sierran 68,300 1.9
M262 California Coastal Range 24,900 0.7
311 Great Plains Steppe and Shrub 17,600 0.5
313 Colorado Plateau Semidesert 75,300 2.1
315 Southwest Plateau/Plains Dry 160,900 4.5
Steppe and Shrub
M313 Arizona-New Mexico Mountains 50,200 1.4
321 Chihuahuan Semidesert 85,200 2.4
322 American Semidesert/Desert 87,700 2.4
331 Great Plains/Palouse Dry 290,700 8.1
Steppe
332 Great Plains Steppe 134,000 3.7
M331 Southern Rocky Mountain 102,300 2.8
M332 Middle Rocky Mountain 81,800 2.3
M333 Northern Rocky Mountain 38,100 1.1
M334 Black Hills 3,700 0.1
341 Intermountain Semidesert/Desert 107,100 3.0
342 Intermountain Semidesert 159,100 4.4
M341 Nevada-Utah Mountains 43,600 1.2
411 Everglades 7,800 0.2
M411 Puerto Rico 3,700 0.1
M423 Hawaiian Islands 6,500 0.2
TOTAL SQUARE MILES 3,592,800