| 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 |
| Serbia and Montenegro | void |
| 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 |
| 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 |
| South Africa | vast interior plateau rimmed by rugged hills and narrow coastal plain |
| South Georgia and the South Sandwich Islands | most of the islands, rising steeply from the sea, are rugged and mountainous; South Georgia is largely barren and has steep, glacier-covered mountains; the South Sandwich Islands are of volcanic origin with some active volcanoes |
| Southern Ocean | the Southern Ocean is deep, 4,000 to 5,000 m over most of its extent with only limited areas of shallow water; the Antarctic continental shelf is generally narrow and unusually deep, its edge lying at depths of 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 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 current, transporting 130 million cubic meters of water per second - 100 times the flow of all the world's rivers |
| Spain | large, flat to dissected plateau surrounded by rugged hills; Pyrenees in north |
| Spratly Islands | flat |
| Sri Lanka | mostly low, flat to rolling plain; mountains in south-central interior |
| Sudan | generally flat, featureless plain; mountains in far south, northeast and west; desert dominates the north |
| Suriname | mostly rolling hills; narrow coastal plain with swamps |
| 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 |
| Swaziland | mostly mountains and hills; some moderately sloping plains |
| Sweden | mostly flat or gently rolling lowlands; mountains in west |
| Switzerland | mostly mountains (Alps in south, Jura in northwest) with a central plateau of rolling hills, plains, and large lakes |
| Syria | primarily semiarid and desert plateau; narrow coastal plain; mountains in west |
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