| Country | Terrain |
| 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 cinder cones of 44 dormant volcanoes; 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 between The Peak and the coastal cliffs |
| Saint Kitts and Nevis | volcanic with mountainous interiors |
| Saint Lucia | volcanic and mountainous with some broad, fertile valleys |
| Saint Martin | void |
| Saint Pierre and Miquelon | mostly barren rock |
| Saint Vincent and the Grenadines | volcanic, mountainous |
| Samoa | two main islands (Savaii, Upolu) and several smaller islands and uninhabited islets; narrow coastal plain with volcanic, rocky, rugged mountains in interior |
| San Marino | rugged mountains |
| Sao Tome and Principe | volcanic, mountainous |
| Saudi Arabia | mostly uninhabited, sandy desert |
| Senegal | generally low, rolling, plains rising to foothills in southeast |
| Serbia | extremely varied; to the north, rich fertile plains; to the east, limestone ranges and basins; to the southeast, ancient mountains and hills |
| Seychelles | Mahe Group is granitic, narrow coastal strip, rocky, hilly; others are coral, flat, elevated reefs |
| Sierra Leone | coastal belt of mangrove swamps, wooded hill country, upland plateau, mountains in east |
| Singapore | lowland; gently undulating central plateau contains water catchment area and nature preserve |
| Sint Maarten | low, hilly terrain, volcanic origin |
| Slovakia | rugged mountains in the central and northern part and lowlands in the south |
| 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 |
| Solomon Islands | mostly rugged mountains with some low coral atolls |
| Somalia | mostly flat to undulating plateau rising to hills in north |
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