Region
Tropics
4
Kenya
3
United States
3
Brazil
2
British Columbia
2
Amazon River Region
1
California
1
Developing countries
1
European Union countries
1
Fraser River
1
Fraser River (B.C.)
1
Northeastern States
1
Northwest, Pacific
1
Ontario
1
San Francisco Bay Area
1
Southern States
1
Washington (State)
1
Wisconsin
1