Region
United States
570
Iran
34
Iraq
20
Russia (Federation)
19
Ukraine
19
Syria
17
Venezuela
17
China
16
Sudan
15
Yemen (Republic)
14
Libya
13
South Sudan
13
Colombia
12
Congo (Democratic Republic)
12
Korea (North)
12
Central African Republic
11
Zimbabwe
11
Belarus
10
Cuba
10
Lebanon
10
Somalia
10
California
8
Washington (D.C.)
8
Afghanistan
7
Burundi
7
Florida
7
Middle East
7
Nicaragua
7
Turkey
7
Balkan Peninsula
6
Burma
6
Mali
6
Mexican-American Border Region
6
Louisiana
5
Mexico
5
Côte d'Ivoire
4
Hong Kong
4
Hong Kong (China)
4
Liberia
4
Russia
4
Texas
4
Canada
3
Ethiopia
3
Kansas
3
Alaska
2
American River Watershed
2
American River Watershed (Calif.)
2
Brazil
2
European Union countries
2
Everglades (Fla.)
2
more ...