Region
Acadia National Park
2
Acadia National Park (Me.)
2
Africa
22
Africa, Central
1
Africa, East
2
Africa, Eastern
1
Africa, North
6
Africa, Southern
8
Africa, Sub-Saharan
3
Africa, West
1
Aklavik (N.W.T.)
1
Alagnak Wild River
1
Alagnak Wild River (Alaska)
1
Alaska
34
Alberta
5
Alps
1
Alps Region
3
Alps, Austrian
1
Amazon River Region
6
America
2
Andes Region
1
Aniakchak National Monument and Preserve
1
Aniakchak National Monument and Preserve (Alaska)
1
Antarctic Ocean
3
Antarctic Peninsula
1
Antarctic Peninsula (Antarctica)
1
Antarctica
19
Antilles, Greater
1
Aparri (Philippines)
1
Appalachian Mountains
2
Appalachian Region
1
Arabian Peninsula
1
Arctic Coast
1
Arctic National Wildlife Refuge
1
Arctic Ocean
4
Arctic Regions
1
Arctic Village
1
Arctic regions
72
Arizona
2
Arkansas
1
Arnold Air Force Base
1
Asia
12
Asia, Central
2
Assateague Island (Md. and Va.)
1
Athabasca Tar Sands
2
Athabasca Tar Sands (Alta.)
2
Atlantic Coast
1
Atlantic Coast (America)
1
Atlantic Coast (Mass.)
1
Atlantic Coast (N.C.)
1
more ...