Chad:
2,000 km
Chile:
725 km
China:
110,000 km (1999)
Christmas Island:
none
Clipperton Island:
none
Cocos (Keeling) Islands:
none
Colombia:
18,140 km (navigable by river boats) (April 1996)
Comoros:
none
Congo, Democratic Republic of the: 15,000 km (including the Congo and its tributaries, and unconnected lakes)
Congo, Republic of the: 1,120 km