Region
United States
50
Australia
15
Africa
9
India
9
California
7
Developing countries
7
North America
6
Costa Rica
4
Latin America
4
Northwest, Pacific
4
Guatemala
3
Madagascar
3
Uttarakhand
3
Africa, Southern
2
Alabama
2
Amazon River Region
2
America
2
Canada
2
Europe, Eastern
2
European Union countries
2
Everglades
2
Florida
2
Florida Bay
2
Malay Archipelago
2
Mexico
2
New Zealand
2
Oregon
2
Serengeti National Park Region
2
Southwestern States
2
Tanzania
2
Texas
2
Tropics
2
Africa, Eastern
1
Africa, West
1
Alta Verapaz
1
Arctic regions
1
Bolivia
1
Cameroon
1
Caribbean Area
1
Cascade-Siskiyou National Monument
1
Cascade-Siskiyou National Monument (Or.)
1
Chile
1
Colombia
1
Colorado River (Colo.-Mexico)
1
Cumberland Gap National Historical Park
1
Denmark
1
Earth (Planet)
1
East (U.S.)
1
East Asia
1
Egypt
1
more ...