word | | Terrain |
| atoll | Wake Island | atoll of three low coral islands, Peale, Wake, and Wilkes, built up on an underwater volcano; central lagoon is former crater, islands are part of the rim |
| atolls | American Samoa | five volcanic islands with rugged peaks and limited coastal plains, two coral atolls (Rose Island, Swains Island) |
| atolls | Cocos (Keeling) Islands | flat, low-lying coral atolls |
| atolls | Cook Islands | low coral atolls in north; volcanic, hilly islands in south |
| atolls | Kiribati | mostly low-lying coral atolls surrounded by extensive reefs |
| atolls | Micronesia, Federated States of | islands vary geologically from high mountainous islands to low, coral atolls; volcanic outcroppings on Pohnpei, Kosrae, and Chuuk |
| atolls | Solomon Islands | mostly rugged mountains with some low coral atolls |
| atolls | Tokelau | low-lying coral atolls enclosing large lagoons |
| atolls | Tuvalu | low-lying and narrow coral atolls |
| Austria | Slovenia | a short coastal strip on the Adriatic, an alpine mountain region adjacent to Italy and Austria, mixed mountains and valleys with numerous rivers to the east |
| average | Antarctica | about 98% thick continental ice sheet and 2% barren rock, with average elevations between 2,000 and 4,000 meters; mountain ranges up to nearly 5,000 meters; ice-free coastal areas include parts of ... |
| average | Arctic Ocean | central surface covered by a perennial drifting polar icepack that, on average, is about 3 meters thick, although pressure ridges may be three times that thickness; clockwise drift pattern in the Beaufort ... |
| average | Southern Ocean | ... 400 to 800 m (the global mean is 133 m); the Antarctic icepack grows from an average minimum of 2.6 million sq km in March to about 18.8 million sq km in ... |