Region
Afghanistan
1
Africa
12
Africa, Eastern
1
Africa, North
3
Africa, Southern
2
Africa, Sub-Saharan
2
Africa, West
1
Alabama
2
Alberta
1
Algeria
1
America
1
Andhra Pradesh
1
Appalachian Region
2
Arab countries
1
Aral Sea Watershed (Uzbekistan and Kazakhstan)
1
Arctic regions
1
Argentina
1
Arizona
1
Asia
13
Asia, Central
3
Atlantic Provinces
1
Australia
13
Azerbaijan
1
BRIC countries
1
Bali (Indonesia : Province)
1
Bali (Province)
1
Bangladesh
2
Baḥr al Ghazāl Province
1
Birmingham
1
Birmingham (Ala.)
1
Blacksburg
1
Bloomington
1
Bolivia
1
British Columbia
1
Burma
3
Byzantine Empire
1
California
5
Cambodia
2
Cameroon
2
Canada
29
Catalonia (Spain)
1
Caucasus
1
Central America
4
Chad
1
Chicago
1
Chicago (Ill.)
1
Chile
1
China
24
Clark County
1
Clark County (Nev.)
1
more ...