word | | Terrain |
| Chaco | Paraguay | grassy plains and wooded hills east of Rio Paraguay; Gran Chaco region west of Rio Paraguay mostly low, marshy plain near the river, and dry forest and thorny scrub elsewhere |
| chains | Greece | mostly mountains with ranges extending into the sea as peninsulas or chains of islands |
| Chuuk | Micronesia, Federated States of | islands vary geologically from high mountainous islands to low, coral atolls; volcanic outcroppings on Pohnpei, Kosrae, and Chuuk |
| cinder | Saint Helena | ... Saint Helena: rugged, volcanic; small scattered plateaus and plains Ascension: surface covered by lava flows and cinder cones of 44 dormant volcanoes; ground rises to the east Tristan da Cunha: sheer cliffs ... |
| circular | Atlantic Ocean | ... and coastal portions of the Baltic Sea from October to June; clockwise warm-water gyre (broad, circular system of currents) in the northern Atlantic, counterclockwise warm-water gyre in the southern Atlantic ... |
| circular | Indian Ocean | surface dominated by counterclockwise gyre (broad, circular system of currents) in the southern Indian Ocean; unique reversal of surface currents in the northern Indian Ocean; low atmospheric pressure over southwest Asia from ... |
| circular | Pacific Ocean | surface currents in the northern Pacific are dominated by a clockwise, warm-water gyre (broad circular system of currents) and in the southern Pacific by a counterclockwise, cool-water gyre; in the ... |
| circular | Saint Helena | ... ground rises to the east Tristan da Cunha: sheer cliffs line the coastline of the nearly circular island; the flanks of the central volcanic peak are deeply dissected; narrow coastal plain lies ... |
| Circumpolar | Southern Ocean | ... about 18.8 million sq km in September, better than a sixfold increase in area; the Antarctic Circumpolar Current (21,000 km in length) moves perpetually eastward; it is the world's largest ocean ... |
| clear | Svalbard | wild, rugged mountains; much of high land ice covered; west coast clear of ice about one-half of the year; fjords along west and north coasts |
| cliffs | Christmas Island | steep cliffs along coast rise abruptly to central plateau |
| cliffs | Faroe Islands | rugged, rocky, some low peaks; cliffs along most of coast |