word | | Terrain |
| Ridge | Arctic Ocean | ... landmasses; the ocean floor is about 50% continental shelf (highest percentage of any ocean) with the remainder a central basin interrupted by three submarine ridges (Alpha Cordillera, Nansen Cordillera, and Lomonosov Ridge |
| Ridge | Atlantic Ocean | ... in the northern Atlantic, counterclockwise warm-water gyre in the southern Atlantic; the ocean floor is dominated by the Mid-Atlantic Ridge, a rugged north-south centerline for the entire Atlantic basin |
| Ridge | Indian Ocean | ... and northeast-to-southwest winds and currents; ocean floor is dominated by the Mid-Indian Ocean Ridge and subdivided by the Southeast Indian Ocean Ridge, Southwest Indian Ocean Ridge, and Ninetyeast Ridge |
| Ridge | Saint Helena | the islands of this group result from volcanic activity associated with the Atlantic Mid-Ocean Ridge Saint Helena: rugged, volcanic; small scattered plateaus and plains Ascension: surface covered by lava flows and ... |
| ridges | Arctic Ocean | ... 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 Gyral Stream, but ... |
| Rift | Ethiopia | high plateau with central mountain range divided by Great Rift Valley |
| Rift | Israel | Negev desert in the south; low coastal plain; central mountains; Jordan Rift Valley |
| Rift | Jordan | mostly desert plateau in east, highland area in west; Great Rift Valley separates East and West Banks of the Jordan River |
| Rift | Kenya | low plains rise to central highlands bisected by Great Rift Valley; fertile plateau in west |
| rim | Iran | rugged, mountainous rim; high, central basin with deserts, mountains; small, discontinuous plains along both coasts |
| rim | Uganda | mostly plateau with rim of mountains |
| rim | 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 |
| rimmed | South Africa | vast interior plateau rimmed by rugged hills and narrow coastal plain |
| ring | Nauru | sandy beach rises to fertile ring around raised coral reefs with phosphate plateau in center |
| ringed | Burma | central lowlands ringed by steep, rugged highlands |
| ringed | Navassa Island | raised coral and limestone plateau, flat to undulating; ringed by vertical white cliffs (9 to 15 m high) |
| Rio | 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 |
| rise | Christmas Island | steep cliffs along coast rise abruptly to central plateau |
| rise | Equatorial Guinea | coastal plains rise to interior hills; islands are volcanic |
| rise | Kenya | low plains rise to central highlands bisected by Great Rift Valley; fertile plateau in west |
| Rise | Pacific Ocean | ... extent in October; the ocean floor in the eastern Pacific is dominated by the East Pacific Rise, while the western Pacific is dissected by deep trenches, including the Mariana Trench, which is ... |
| rise | United States Pacific Island Wildlife Refuges | low and nearly level sandy coral islands with narrow fringing reefs that have developed at the top of submerged volcanic mountains, which in most cases rise steeply from the ocean floor |
| rises | Angola | narrow coastal plain rises abruptly to vast interior plateau |
| rises | Barbados | relatively flat; rises gently to central highland region |
| rises | Brunei | flat coastal plain rises to mountains in east; hilly lowland in west |
| rises | Nauru | sandy beach rises to fertile ring around raised coral reefs with phosphate plateau in center |
| rises | Saint Helena | ... 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 line the coastline of the nearly circular ... |
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