Region
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Calaveras County
1
Calhoun County
1
California
112
California, Southern
2
Cambodia
1
Cambridge
1
Camp Lejeune
4
Camp Lejeune (N.C.)
1
Canada
14
Canada, Western
1
Canadian-American Border Region
1
Cannonsville Reservoir Watershed
1
Cannonsville Reservoir Watershed (N.Y.)
1
Canon City
1
Cap-Rouge (Québec)
1
Cape Cod
3
Cape Cod National Seashore
1
Cape Cod National Seashore (Mass.)
1
Cape Fear River Estuary
1
Carson River Valley
1
Carson River Watershed
2
Carson River, East Fork (Calif. and Nev.)
1
Carson River, West Fork (Calif. and Nev.)
1
Cary
1
Cass Lake
1
Cauca River
1
Cedar Falls
1
Central Valley
1
Champlain, Lake
5
Charles River
1
Chattanooga Region
1
Cherokee County
1
Chesapeake Bay (Md. and Va.)
17
Chesapeake Bay Region (Md. and Va.)
2
Chesapeake Bay Watershed
4
Chesapeake Bay Watershed (Md. and Va.)
1
Chesapeake and Ohio Canal National Historical Park
2
Cheshire (Ohio : Township)
1
Chester County
1
Chicago
3
Chicago Metropolitan Area
1
Chile
2
Chilton County
1
China
45
Chornobylʹ (Ukraine)
1
Churchill County
1
Cincinnati
1
Clackamas River
1
Clallam County
1
Clayton
1
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