| Country | Location |
| Serbia | Southeastern Europe, between Macedonia and Hungary |
| Seychelles | archipelago in the Indian Ocean, northeast of Madagascar |
| Sierra Leone | Western Africa, bordering the North Atlantic Ocean, between Guinea and Liberia |
| Singapore | Southeastern Asia, islands between Malaysia and Indonesia |
| Slovakia | Central Europe, south of Poland |
| Slovenia | Central Europe, eastern Alps bordering the Adriatic Sea, between Austria and Croatia |
| Solomon Islands | Oceania, group of islands in the South Pacific Ocean, east of Papua New Guinea |
| Somalia | Eastern Africa, bordering the Gulf of Aden and the Indian Ocean, east of Ethiopia |
| South Africa | Southern Africa, at the southern tip of the continent of Africa |
| South Georgia and the South Sandwich Islands | Southern South America, islands in the South Atlantic Ocean, east of the tip of South America |
| Southern Ocean | body of water between 60 degrees south latitude and Antarctica |
| Spain | Southwestern Europe, bordering the Bay of Biscay, Mediterranean Sea, North Atlantic Ocean, and Pyrenees Mountains, southwest of France |
| Spratly Islands | Southeastern Asia, group of reefs and islands in the South China Sea, about two-thirds of the way from southern Vietnam to the southern Philippines |
| Sri Lanka | Southern Asia, island in the Indian Ocean, south of India |
| Sudan | Northern Africa, bordering the Red Sea, between Egypt and Eritrea |
| Suriname | Northern South America, bordering the North Atlantic Ocean, between French Guiana and Guyana |
| Svalbard | Northern Europe, islands between the Arctic Ocean, Barents Sea, Greenland Sea, and Norwegian Sea, north of Norway |
| Swaziland | Southern Africa, between Mozambique and South Africa |
| Sweden | Northern Europe, bordering the Baltic Sea, Gulf of Bothnia, Kattegat, and Skagerrak, between Finland and Norway |
| Switzerland | Central Europe, east of France, north of Italy |
| Syria | Middle East, bordering the Mediterranean Sea, between Lebanon and Turkey |
| Taiwan | Eastern Asia, islands bordering the East China Sea, Philippine Sea, South China Sea, and Taiwan Strait, north of the Philippines, off the southeastern coast of China |
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