Region
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California
11
Canada
4
Caribbean Area
5
Carlow (County)
1
Carlow (Ireland : County)
1
Carson River (Nev.)
1
Cartagena
1
Cartagena (Colombia)
1
Caucasus
2
Caucasus, Northern
1
Caucasus, South
1
Cedar Mountains
1
Cedar Mountains (South Africa)
1
Central America
2
Centralia
1
Centralia (Pa.)
1
Cheshire
2
Cheshire (England)
2
Chiapas
2
Chiapas (Mexico)
2
Chicago
6
Chicago (Ill.)
7
Chile
3
Chimalapas Region
1
Chimalapas Region (Mexico)
1
Chimborazo
3
China
19
Choctaw Nation of Oklahoma
2
Coalfield
1
Coalfield (Tenn.)
1
Cochester Region (England)
2
Cochise County
2
Cochise County (Ariz.)
2
Colchester Region
3
Colchester Region (England)
1
Colombia
15
Colorado
2
Confederate States of America
4
Congo (Democratic Republic)
1
Cotahuasi River Watershed
2
Côte d'Ivoire
1
Crown Heights (New York, N.Y.)
1
Cuba
3
Cyprus
4
Denmark
1
Derbyshire
3
Derbyshire (England)
3
Detroit
2
Detroit (Mich.)
2
Developing countries
11
more ...