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Cabalian - Philippines
Caburgua - Chile
Cacao - Costa Rica
Cagua - Philippines
Calabozos - Chile
Calayo - Philippines
Calbuco - Chile         Extra
Callaqui - Chile
Cameroon - Cameroon
Camiguin de Babuyanes - Philippines         Extra
Campi Flegrei - Italy
Campi Flegrei Mar Sicilia - Italy
Candlemas Island - S. Sandwich Islands
Canlaon - Philippines         Extra
Capital - Alaska
Capulin - New Mexico         Extra
Carlisle - Alaska         Extra
Carran-Los Venados - Chile
Carrizozo - New Mexico         Extra
Casiri - Peru
Casita - Nicaragua
Catherine - Ethiopia
Cayambe - Ecuador         Extra
Cayley - Canada
Cayute-La Vigueria - Chile
Ceboruco - Mexico
Cedar Hill - Nevada
Central Island - Kenya
Cerberus - Alaska
Cereme - Indonesia         Extra
Cerros del Rio - New Mexico
Chacana - Ecuador
Chachani - Peru
Chagulak - Alaska
Chaine des Puys - France         Extra
Chaiten - Chile
Chao Lava - Chile Extra
Chapulul - Chile
Chascon - Peru
Chascon de Purico - Chile
Chato - Costa Rica
Cherny - Russia
Chichigalpa - Nicaragua
Chichinautzin Volcanic Field - Mexico
Chiginagak - Alaska         Extra
Chikurachki - Russia
Chilcotin Plateau Basalts - Canada
Chiliques - Chile         Extra
Chillahuita - Chile
Chillan - Chile
Chimborazo - Ecuador
Chinameca - El Salvador
Chingo Volcanic Field - Guatemala
Chiquimula Volcanic Field - Guatemala
Chiracha - Ethiopia
Chirinkotan - Russia
Chirip - Russia
Chirpoi - Russia
Chokai - Japan
Chufquen - Chile
Chuga-Ryong - korean penninsula (DMZ)
Churchill - Alaska         Extra
Chyulu Hills Volcanic Field - Kenya
Ciguatepe - Nicaragua
Cima Volcanic Range - California
Cinnamon Butte - Oregon
Cinotepec Volcanic Field - El Salvador
Clayton Valley - Nevada
Clear Lake Volcanic Field - California         Extra
Clear Water Volcanic Field
Cleft Segment - Pacific Ocean
Cleveland - Alaska         Extra
Coatepeque - El Salvador         Extra         Extra
Coaxial Segment - Pacific Ocean
Cochague - El Salvador
Cofre de Perote - Mexico
Coffeepot Crater - Oregon
Colachi - Chile
Cold Bay Volcanic Field - Alaska
Coleman Seamount - Solomon Islands
Colima Volcanic Complex - Mexico         Extra
Coliseum Maar - Arizona
Colluma - Bolivia
Colo - Indonesia
Columbia Plateau - Washington         Extra
Comondu-La Purisima Volcanic Field - Mexico
Concepcion - Nicaragua         Extra
Conchagua - El Salvador
Conchaguita - El Salvador
Condor - Argentina
Cook Island - S. Sandwich Islands
Copahue - Chile         Extra
Copiapo - Chile
Corbetti Caldera - Ethiopia
Corcovado - Chile
Cordon del Azufre Volcanic Complex - Argentina         Extra
Cordon Caulle - Chile         Extra
Cordon Chalviri - Chile
Cordon de Puntas Negras - Chile
Coronado - Mexico
Coropuna - Peru         Extra
Corvo - Azores
Cosiguina - Nicaragua         Extra
Coso Volcanic Field - California         Extra
Cotopaxi - Ecuador         Extra
Coulman Island - Antarctica
Cowhorn Mountain - Oregon
Cracker Creek - Canada
Crater 160 - Arizona
Crater Butte - Oregon
Crater Flat - Nevada
Crater Lake - Oregon         Extra         Extra
Craters of the Moon Volcanic Field - Idaho         Extra         Extra
Crater Mountain - Papua New Guinea
Crow Lagoon - Canada
Cuicocha - Ecuador
Cu-Lao Re Group Volcanic Field - Vietnam
Cuilapa-Barbarena Volcanic Field - Guatemala
Cumbal - Colombia
Curacao - Tonga
Curtis Island - New Zealand
Cusin - Ecuador