Region
Adirondack Mountains Region
1
Adirondack Mountains Region (N.Y.)
1
Alagnak Wild River
1
Alagnak Wild River (Alaska)
1
Alaska
7
Alberta
1
Amazon River Region
4
Amazon River Valley
1
Aral Sea (Uzbekistan and Kazakhstan)
1
Arctic regions
3
Atlantic Coast
3
Atlantic Coast (Brazil)
2
Atlantic Coast (Ga.)
1
Australia
2
Big Bend National Park
1
Big Bend National Park (Tex.)
1
Boston Region
1
Boston Region (Mass.)
1
Brazil
2
California
4
Canada, Northern
1
Cape Cod
1
Cape Cod (Mass.)
1
China
3
Chisago County
1
Chisago County (Minn.)
1
Civilization, Medieval
1
Colombia
1
Congaree National Park
1
Congaree National Park (S.C.)
1
Connecticut River Valley
2
Darling River Watershed (Qld. and N.S.W.)
1
Denali National Park and Preserve
1
Denali National Park and Preserve (Alaska)
1
East Asia
1
England
1
Europe
2
Europe, Eastern
1
Florida
1
Galapagos Islands
4
Ganges River Valley (India and Bangladesh)
1
Georgia
1
Germany (East)
1
Grant-Kohrs Ranch National Historic Site
1
Grant-Kohrs Ranch National Historic Site (Mont.)
1
Great Barrier Reef (Qld.)
1
Great Britain
1
Great Lakes (North America)
1
Great Lakes Region (North America)
1
Great Plains
1
more ...