Region
Abraham Lincoln Birthplace National Historical Park
1
Abraham Lincoln Birthplace National Historical Park (Ky.)
1
Acadia National Park
3
Acadia National Park (Me.)
3
Adelaide (S.A.)
2
Adelanto
1
Afghanistan
30
Africa
40
Africa, Central
3
Africa, East
2
Africa, Eastern
4
Africa, North
2
Africa, Southern
14
Africa, Sub-Saharan
13
Africa, West
2
Africa--
1
Agate Fossil Beds National Monument
1
Agate Fossil Beds National Monument (Neb.)
1
Ahmada?ba?d
1
Alabama
7
Alabama River Watershed
3
Alagnak Wild River
1
Alagnak Wild River (Alaska)
1
Alaska
64
Alaska Peninsula
2
Alaska, Southcentral
2
Alaska, Southeast
3
Alaska, Southwest
1
Alberta
2
Alibates Flint Quarries National Monument
1
Alibates Flint Quarries National Monument (Tex.)
1
Alsek River
1
Amazon River Region
8
Amazon River Watershed
2
America
5
American Samoa
4
Andes Region
1
Andhra Pradesh
2
Angkor (Extinct city)
1
Aniakchak National Monument and Preserve
1
Aniakchak National Monument and Preserve (Alaska)
1
Antarctica
1
Apalachicola Bay
1
Apalachicola National Forest (Fla.)
1
Apalachicola River Watershed
4
Apostle Islands National Lakeshore
3
Apostle Islands National Lakeshore (Wis.)
4
Appalachian Region
1
Arab countries
1
Aral Sea (Uzbekistan and Kazakhstan)
1
more ...