Region
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Bhutan
1
Blackfeet Indian Reservation
1
Blackfeet Tribe of the Blackfeet Indian Reservation of Montana
1
Bolivia
4
Bosnia and Herzegovina
3
Brazil
8
Bristol Bay Watershed
1
Brunei
1
Bulgaria
1
Burkina Faso
1
Burma
28
Burundi
1
Cabo Verde
1
California
28
California, Southern
1
Cambodia
5
Cameroon
3
Canada
46
Canadian-American Border Region
1
Caribbean Area
31
Caucasus, South
1
Central African Republic
2
Central America
13
Central Valley (Valley)
1
Chad Basin
1
Champlain, Lake
1
Charleston
1
Cherokee Nation
2
Chesapeake Bay (Md. and Va.)
5
Chesapeake Bay Region (Md. and Va.)
1
Chesapeake Bay Watershed
1
Chicago (Ill.)
1
Chile
3
China
177
Colombia
12
Colorado
19
Colorado River (Colo.-Mexico)
2
Colorado River Watershed (Colo.-Mexico)
7
Columbia River
3
Columbia River Watershed
4
Confederate States of America
2
Congo (Brazzaville)
1
Congo (Democratic Republic)
4
Connecticut
1
Coronado National Forest (Ariz. and N.M.)
1
Costa Rica
1
Croatia
2
Cuba
21
Cyprus
2
Côte d'Ivoire
1
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