Region
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Great Plains
7
Jackson
7
Long Island
7
Marcellus Shale
7
Middle East
7
Nebraska
7
New Zealand
7
Ochoco National Forest
7
Oklahoma
7
Prince William Sound (Alaska)
7
Prince William Sound Region
7
Rogue River-Siskiyou National Forest (Or. and Calif.)
7
San Diego
7
San Francisco
7
Sierra National Forest
7
South America
7
South Asia
7
Willamette National Forest
7
Yellowstone National Park
7
Yucca Mountain
7
Zimbabwe
7
Animas River Watershed (Colo. and N.M.)
6
Anniston
6
Appalachian Region, Southern
6
Atlantic Coast
6
Atlantic Coast (U.S.)
6
Dakota Access Pipeline
6
East Asia
6
Everglades
6
Hudson River (N.Y. and N.J.)
6
Inyo National Forest (Calif. and Nev.)
6
Lane County
6
Marshall Islands
6
Middle West
6
Ontario
6
Puget Sound
6
San Joaquin Valley
6
San Juan Basin (N.M. and Colo.)
6
Santa Fe National Forest
6
Santa Fe National Forest (N.M.)
6
Seattle
6
Shoshone National Forest
6
Sweden
6
Vietnam
6
Yampa River Watershed
6
Acadia National Park (Me.)
5
America
5
Arctic Ocean
5
Argentina
5
Arkansas
5
more ...