Region
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Cheasapeake Bay Region (Md. and Va.)
1
Chesapeake Bay (Md. and Va.)
3
Chesapeake Bay Region (Md. and Va.)
1
Chiapas
2
Chiapas (Mexico)
2
Chile
2
China
11
Chukchi Sea
1
Chʻungchʻŏng-namdo (Korea)
1
Cibola National Wildlife Refuge (Calif.)
1
Clare
1
Clare (Ireland)
1
Coden (Ala.)
2
Cold regions
1
Colombia
3
Colorado
8
Colorado River
1
Colorado River (Colo.-Mexico)
5
Colorado River Watershed
1
Colorado River Watershed (Colo.-Mexico)
5
Columbia County
1
Columbia County (Pa.)
1
Columbia River
22
Columbia River Estuary
1
Columbia River Estuary (Or. and Wash.)
1
Columbia River Region
2
Columbia River Watershed
22
Colville National Forest
1
Colville National Forest (Wash.)
1
Connecticut
2
Connecticut River Valley
1
Connecticut River Watershed
1
Connecticut River watershed
1
Coos Bay
1
Coos Bay Estuary
1
Cougar Dam
1
Cougar Dam (Or.)
1
Cougar Reservoir
1
Cowanesque River (Pa. and N.Y.)
1
Cowlitz River
1
Cowlitz River (Wash.)
2
Cowlitz River Watershed
2
Craig
1
Craig (Alaska)
1
Croatia
1
Crystal River National Wildlife Refuge
1
Cuba
3
Cumberland River (Ky. and Tenn.)
1
Cumberland River Watershed (Ky. and Tenn.)
1
Dakshin Dinajpur (District)
1
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