Region
Aachen
1
Aberdeen Proving Ground
1
Aberdeen Proving Ground (Md.)
2
Adams County
1
Admiralty Islands
2
Afghanistan
41
Africa
2
Africa, North
18
Africa, West
1
Afrique du Nord
2
Afton Region
1
Afton Region (N.Y.)
1
Ahsahka
1
Al Bāb
1
Alabama
32
Alabama River Watershed
3
Alaska
28
Alaska Highway
1
Albania
1
Albany
1
Albuquerque
1
Alcatraz Island
1
Alcatraz Island (Calif.)
1
Aleutian Islands
2
Alexandria
1
Alexandria (Va.)
1
Algeria
2
Allagash River Watershed
1
Allegany (N.Y.)
1
Allemagne
4
Alsace
2
Alsace (France)
2
Altamaha River
1
Amaknak Island (Alaska)
1
America
2
American Bottom
1
American River
2
American Samoa
1
Amirauté, Îles de l'
1
Anbār (Province)
1
Andes
1
Angelina River (Tex.)
1
Angola
1
Angola (La.)
1
Antietam National Battlefield (Md.)
2
Apalachicola River (Fla.)
1
Apalachicola River Watershed
3
Arctic Regions
1
Arctic regions
4
Ardennes
2
more ...