World Factbook
- Cabinda (province)
- Cabot Strait
- Caicos Islands
- Cairo (capital)
- Calcutta (city)
- Calgary (city)
- California, Gulf of
- Cameroun (local name for Cameroon)
- Campbell Island
- Campeche, Bay of
- Canal Zone (former name for US possessions in Panama)
- Canarias Sea
- Canary Islands
- Canberra (capital)
- Cancun (city)
- Canton (city; now Guangzhou)
- Canton Island (Kanton Island)
- Cape Juby (region; former name for Southern Morocco)
- Cape of Good Hope (cape; also alternate name for Cape Province of South Africa)
- Cape Province (region; former name for Northern, Western, and Eastern Cape Provinces of South Africa)
- Cape Town (legislative capital)
- Caracas (capital)
- Cargados Carajos Shoals
- Caribbean Sea
- Carpatho-Ukraine (region; former name for Zakarpattya oblast')
- Carpentaria, Gulf of
- Casablanca (city)
- Castries (capital)
- Catalonia (region)
- Cato Island
- Caucasus (region)
- Cayenne (regional capital)
- Celebes (island)
- Celebes Sea
- Celtic Sea
- Central African Empire (former name for Central African Republic)
- Ceram (Seram) Sea
- Cetinje (capital city)
- Ceuta (city)
- Ceylon (former name for Sri Lanka)
- Chafarinas, Islas (island)
- Chagos Archipelago (Oil Islands)
- Challenger Deep (Mariana Trench)
- Charlotte Amalie (capital)
- Chatham Islands
- Chechnya (region; also Chechnia)
- Cheju-do (island)
- Cheju Strait
- Chengdu (city)
- Chennai (city; also Madras)
- Chesterfield Islands (Iles Chesterfield)
- Chihli, Gulf of (see Bo Hai)
- Chiloe (island)
- China, People's Republic of
- China, Republic of
- Chisinau (capital; also Kishinev)
- Choiseul (island)
- Choson (local name for North Korea)
- Christmas Island (Indian Ocean)
- Christmas Island (Pacific Ocean; also Kiritimati)
- Chukchi Sea
- Chuuk Islands (Truk Islands)
- Cilicia (region)
- Ciskei (enclave)
- Citta del Vaticano (local name for Vatican City)
- Cochin China (region)
- Coco, Isla del (island)
- Cocos Islands
- Colombo (capital)
- Colon, Archipielago de (Galapagos Islands)
- Commander Islands (Komandorskiye Ostrova)
- Comores (local name for Comoros)
- Conakry (capital)
- Confederatio Helvetica (local name for Switzerland)
- Congo (Brazzaville) (former name for Republic of the Congo)
- Congo (Leopoldville) (former name for the Democratic Republic of the Congo)
- Con Son (islands)
- Constantinople (city; former name for Istanbul)
- Cook Strait
- Copenhagen (capital)
- Coral Sea
- Corfu (island)
- Corinth (region)
- Corisco (island)
- Corn Islands (Islas del Maiz)
- Corsica (island; also Corse)
- Cosmoledo Group (island group; also Atoll de Cosmoledo)
- Cotonou (former capital)
- Cotopaxi (volcano)
- Cozumel (island)
- Crete (island)
- Crimea (region)
- Crimean Peninsula
- Crooked Island Passage
- Crozet Islands (Iles Crozet)
- Cyclades (island group)
- Cyrenaica (region)