Region
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Appalachian Region
2
Appalachian Region, Southern
4
Appalachian Trail
1
Aral Sea (Uzbekistan and Kazakhstan)
1
Arapaho National Forest
1
Arches National Park (Utah)
1
Arctic National Wildlife Refuge (Alaska)
1
Arctic regions
4
Argentina
21
Arizona
50
Arkansas
4
Arkansas River
1
Armenia
1
Armenia (Republic)
8
Arrowwood National Wildlife Refuge
1
Arrowwood National Wildlife Refuge (N.D.)
1
Aruba
3
Ascension
7
Ashland Ranger District
1
Ashley National Forest (Utah and Wyo.)
3
Asia
21
Asia, Central
3
Aspen (Colo.)
1
Assateague Island (Md. and Va.)
1
Atlantic Coast
1
Atlantic Coast (North America)
3
Atlantic Coast (U.S.)
18
Atlantic Ocean
10
Auke Bay (Alaska : Bay)
1
Auke Bay (Bay)
1
Australia
55
Australia, Northern
1
Austria
6
Ayalán Cemetery Site
1
Ayalán Cemetery Site (Ecuador)
1
Azerbaijan
10
Babylon (Extinct city)
1
Baghdad
3
Bahamas
11
Bahrain
5
Balkan Peninsula
4
Balochistān
1
Baltic Sea
1
Baltic Sea Region
1
Bandiagara Caves (Mali)
2
Banghāzī
1
Bangladesh
13
Barbados
3
Barra do Corda
1
Barro Colorado Island
2
more ...