Region
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Andhra Pradesh (India)
1
Aniakchak National Monument and Preserve
1
Aniakchak National Monument and Preserve (Alaska)
1
Anniston
2
Anniston (Ala.)
2
Anoka County
1
Antarctica
14
Antietam National Battlefield
1
Antietam National Battlefield (Md.)
1
Antikythēra Island
2
Antikythēra Island (Greece)
2
Antilles, Greater
1
Apache-Sitgreaves National Forest
16
Apache-Sitgreaves National Forest (Ariz.)
16
Apalachicola Bay
2
Apalachicola Bay (Fla.)
1
Apalachicola River
1
Apostle Islands National Lakeshore
1
Apostle Islands National Lakeshore (Wis.)
1
Appalachian Mountains
1
Appalachian Region
11
Appalachian Region, Southern
8
Arabah Valley (Israel and Jordan)
1
Arabian Peninsula
1
Aral Sea (Uzbekistan and Kazakhstan)
2
Arctic Coast (Russia)
1
Arctic National Wildlife Refuge
5
Arctic National Wildlife Refuge (Alaska)
5
Arctic Ocean
3
Arctic Regions
3
Arctic Village
2
Arctic Village (Alaska)
1
Arctic regions
129
Argentina
1
Arizona
50
Arkansas
2
Arrowrock Reservoir
1
Arrowrock Reservoir (Idaho)
1
Ashton/Island Park Ranger District (Idaho)
2
Asia
12
Asia, Central
2
Asie
1
Asie du Sud-Est
1
Asien
1
Atchafalaya River Region
1
Atchafalaya River Region (La.)
1
Athabasca River
1
Athabasca River Watershed
1
Athabasca River Watershed (Alta.)
1
Athabasca Tar Sands (Alta.)
2
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