Region
Africa
3
Alabama
2
Alaska
4
American River Watershed
1
American River Watershed (Calif.)
1
Appalachian Region, Southern
1
Arctic regions
5
Arizona
1
Australia
1
Austria
1
Biscayne National Park
1
Bluestone National Scenic River (W. Va.)
1
Borneo
1
California
13
Canada
1
Cheyenne Bottoms
1
Cheyenne Bottoms (Kan.)
1
Chincoteague National Wildlife Refuge (Va. and Md.)
2
Coachella Valley
1
Coachella Valley (Calif.)
1
Colorado
1
Congo River
1
Congo River Valley
1
Cowpens National Battlefield
1
Cowpens National Battlefield (S.C.)
1
Cumberland County
1
Dauphin Island
1
Dauphin Island (Ala.)
1
Devils Postpile National Monument
1
Devils Postpile National Monument (Calif.)
1
Don Edwards San Francisco Bay National Wildlife Refuge
2
Don Edwards San Francisco Bay National Wildlife Refuge (Calif.)
2
Earth (Planet)
12
El Malpais National Monument
1
El Malpais National Monument (N.M.)
1
Florida
4
Fort Lauderdale
1
Fort Lauderdale (Fla.)
1
Galapagos Islands
1
Gauley River National Recreation Area (W. Va.)
1
Georges Bank
1
Georgia
2
Glenwood Region
1
Grand Canyon National Park
1
Grand Canyon National Park (Ariz.)
1
Great Barrier Reef (Qld.)
1
Great Basin
2
Great Britain
2
Horseshoe Bend National Military Park
1
Horseshoe Bend National Military Park (Ala.)
1
more ...