| Country | Terrain |
| 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 |
| Taiwan | eastern two-thirds mostly rugged mountains; flat to gently rolling plains in west |
| Tajikistan | Pamir and Alay Mountains dominate landscape; western Fergana Valley in north, Kofarnihon and Vakhsh Valleys in southwest |
| Tanzania | plains along coast; central plateau; highlands in north, south |
| Thailand | central plain; Khorat Plateau in the east; mountains elsewhere |
| Timor-Leste | mountainous |
| Togo | gently rolling savanna in north; central hills; southern plateau; low coastal plain with extensive lagoons and marshes |
| Tokelau | low-lying coral atolls enclosing large lagoons |
| Tonga | most islands have limestone base formed from uplifted coral formation; others have limestone overlying volcanic base |
| Trinidad and Tobago | mostly plains with some hills and low mountains |
| Tunisia | mountains in north; hot, dry central plain; semiarid south merges into the Sahara |
| Turkey | high central plateau (Anatolia); narrow coastal plain; several mountain ranges |
| Turkmenistan | flat-to-rolling sandy desert with dunes rising to mountains in the south; low mountains along border with Iran; borders Caspian Sea in west |
| Turks and Caicos Islands | low, flat limestone; extensive marshes and mangrove swamps |
| Tuvalu | low-lying and narrow coral atolls |
| Uganda | mostly plateau with rim of mountains |
| Ukraine | most of Ukraine consists of fertile plains (steppes) and plateaus, mountains being found only in the west (the Carpathians), and in the Crimean Peninsula in the extreme south |
| United Arab Emirates | flat, barren coastal plain merging into rolling sand dunes of vast desert wasteland; mountains in east |
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