| Country | Terrain |
| Congo, Democratic Republic of the | vast central basin is a low-lying plateau; mountains in east |
| Congo, Republic of the | coastal plain, southern basin, central plateau, northern basin |
| Cook Islands | low coral atolls in north; volcanic, hilly islands in south |
| Coral Sea Islands | sand and coral reefs and islands (or cays) |
| Costa Rica | coastal plains separated by rugged mountains including over 100 volcanic cones, of which several are major volcanoes |
| Cote d'Ivoire | mostly flat to undulating plains; mountains in northwest |
| Croatia | geographically diverse; flat plains along Hungarian border, low mountains and highlands near Adriatic coastline and islands |
| Cuba | mostly flat to rolling plains, with rugged hills and mountains in the southeast |
| Curacao | generally low, hilly terrain |
| Cyprus | central plain with mountains to north and south; scattered but significant plains along southern coast |
| Czech Republic | Bohemia in the west consists of rolling plains, hills, and plateaus surrounded by low mountains; Moravia in the east consists of very hilly country |
| Denmark | low and flat to gently rolling plains |
| Dhekelia | void |
| Djibouti | coastal plain and plateau separated by central mountains |
| Dominica | rugged mountains of volcanic origin |
| Dominican Republic | rugged highlands and mountains with fertile valleys interspersed |
| Ecuador | coastal plain (costa), inter-Andean central highlands (sierra), and flat to rolling eastern jungle (oriente) |
| Egypt | vast desert plateau interrupted by Nile valley and delta |
| El Salvador | mostly mountains with narrow coastal belt and central plateau |
| Equatorial Guinea | coastal plains rise to interior hills; islands are volcanic |