Region
Tropics
48
United States
43
India
41
Africa
22
Japan
19
Asia
18
Europe
17
China
15
Developing countries
13
Africa, Sub-Saharan
12
Great Britain
12
Australia
11
Egypt
11
Brazil
8
North America
8
Latin America
7
Bangladesh
6
Mediterranean Region
6
New Zealand
6
South Asia
6
Antarctica
5
Canada
5
Himalaya Mountains Region
5
Iran
5
Italy
5
Southeast Asia
5
Amazon River Region
4
California
4
Mexico
4
Northwest, Pacific
4
Russia (Federation)
4
Alaska
3
Argentina
3
Balkan Peninsula
3
Chile
3
East (U.S.)
3
England
3
Indonesia
3
Iowa
3
Middle East
3
Nepal
3
Pakistan
3
South America
3
Sri Lanka
3
Tanzania
3
Africa, Southern
2
Africa, West
2
Asia, Central
2
Caribbean Area
2
Central America
2
more ...