| Centre Hills(expression, name, volcano, geology) |
| Cerro Blanco(expression, name, volcano, geology) |
| Chaine des Puys(expression, name, volcano, geology) |
| Cheb Basin(expression, name, volcano, geology) |
| Chew Bahir(expression, name, volcano, geology) |
| Chilcotin Group-North(expression, name, volcano, geology) |
| Chilcotin Group-South(expression, name, volcano, geology) |
| Chilung Group(expression, name, volcano, geology) |
| China Hat-East Butte(expression, name, volcano, geology) |
| Chott Tigri Volcanic Field(expression, name, volcano, geology) |
| Chudleigh Volcanic Province(expression, name, volcano, geology) |
| Cima Lava Field(expression, name, volcano, geology) |
| Cinder Butte(expression, name, volcano, geology) |
| Clayton Valley(expression, name, volcano, geology) |
| Cochiquito Volcanic Group(expression, name, volcano, geology) |
| Copco Lake(expression, name, volcano, geology) |
| Coropuna(noun, name, volcano, geology) |
| Coso Volcanic Field(expression, name, volcano, geology) |
| Cowhorn Mountain(expression, name, volcano, geology) |
| Crary Group(expression, name, volcano, geology) |