Region
Africa
1
Africa, Southern
1
Alabama
3
Alaska
7
Alaska, Gulf of
1
Alaska, Southwest
2
Amazon River Valley
1
Antarctic Ocean
1
Apalachicola River
1
Apalachicola River Watershed
1
Appalachian Region
1
Appalachian Region, Southern
1
Arctic regions
1
Arizona
3
Arkansas
2
Atlantic Coast (South Atlantic States)
2
Atlantic Coast (U.S.)
1
Australia
2
Baikal, Lake, Watershed (Russia)
1
Bangladesh
2
Barbados
1
Bering Land Bridge National Preserve (Alaska)
1
Bering Sea
2
Bermuda
1
Big Hole National Battlefield
1
Big Hole National Battlefield (Mont.)
1
Blue Ridge Mountains
2
Borgne, Lake
3
Borgne, Lake (La.)
3
Borneo
1
Brazil
1
California
33
Canada
3
Canaveral National Seashore
1
Canaveral National Seashore (Fla.)
1
Cape Krusenstern National Monument (Alaska)
1
Caribbean Area
4
Cascade-Siskiyou National Monument
1
Cascade-Siskiyou National Monument (Or.)
1
Catoctin Mountain Park
1
Catoctin Mountain Park (Md.)
1
Central Valley
1
Channel Islands National Park
1
Channel Islands National Park (Calif.)
1
Chattahoochee River Watershed
1
Chesapeake Bay (Md. and Va.)
2
Chihuahuan Desert
1
Coconino National Forest (Ariz.)
1
Collier County
1
Collier County (Fla.)
1
more ...