Region
Adirondack Park
1
Afghanistan
1
Africa
16
Africa, Eastern
2
Africa, North
2
Africa, Southern
4
Africa, Sub-Saharan
3
Africa, West
2
Ajusco
2
Alabama
1
Alaska
14
Alberta
2
Alberta, Northern
1
Alīpura
1
Alīpura (India)
1
Amazon River Region
5
America
1
Antarctica
5
Apalachicola Bay
1
Apalachicola River
1
Appalachian Region
6
Appalachian Region, Southern
1
Appalachian Trail
1
Aral Sea (Uzbekistan and Kazakhstan)
1
Aral Sea Watershed (Uzbekistan and Kazakhstan)
2
Arctic National Wildlife Refuge (Alaska)
1
Arctic regions
94
Argentina
3
Arizona
4
Asia
14
Asia, Central
2
Aspen
1
Aspen (Colo.)
1
Athabasca Tar Sands (Alta.)
1
Atlantic Ocean
1
Atlantic States
1
Australia
17
Baltic Sea
3
Baltic States
1
Bamako
1
Bangladesh
1
Baringo District
1
Baringo District (Kenya)
1
Beaufort County (S.C.)
1
Belarus
1
Bolivia
1
Bosnia and Herzegovina
1
Boston
1
Boston Region
1
Boston Region (Mass.)
1
more ...