Region
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Bronx
1
Bronx (N.Y.) arch
1
California
35
California, Southern
2
Cambridge
4
Canada
33
Cape Lookout National Seashore (N.C.)
5
Caribbean Area
2
Carlsbad Caverns National Park (N.M.)
1
Chesapeake Bay (Md. and Va.)
1
Cheshire (England)
1
Chicago
3
Chicxulub Crater
1
Chile
4
China
83
China, Southwest
1
Chincoteague National Wildlife Refuge (Va. and Md.)
1
Colombia
2
Colorado
255
Colorado National Monument
1
Colorado National Monument (Colo.)
1
Colorado River Watershed (Colo.-Mexico)
1
Colorado Springs
1
Columbia River Watershed
1
Columbus
1
Commonwealth countries
1
Connecticut
11
Crow Tribe of Montana
1
Cuba
1
Delaware
2
Delaware River Watershed (N.Y.-Del. and N.J.)
1
Denver
4
Detroit
2
Developing countries
10
Earth
3
Earth (Planet)
15
East Asia
10
Ecuador
1
Edmonton (Alta.)
1
Egypt
4
El Malpais National Monument
1
El Salvador
2
Embudo
1
England
16
English-speaking countries
6
Etna, Mount
1
Etna, Mount (Italy)
1
Europe
54
Europe, Central
1
Europe, Eastern
2
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