| Country | Terrain |
| 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 |
| Tromelin Island | void |
| 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 | very 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 |
| United Kingdom | mostly rugged hills and low mountains; level to rolling plains in east and southeast |
| United States | vast central plain, mountains in west, hills and low mountains in east; rugged mountains and broad river valleys in Alaska; rugged, volcanic topography in Hawaii |
| 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 |
| Uruguay | mostly rolling plains and low hills; fertile coastal lowland |
| Uzbekistan | mostly flat-to-rolling sandy desert with dunes; broad, flat intensely irrigated river valleys along course of Amu Darya, Syr Darya (Sirdaryo), and Zarafshon; Fergana Valley in east surrounded by mountainous Tajikistan and Kyrgyzstan; shrinking Aral Sea in west |
| Vanuatu | mostly mountainous islands of volcanic origin; narrow coastal plains |
| Venezuela | Andes Mountains and Maracaibo Lowlands in northwest; central plains (llanos); Guiana Highlands in southeast |
| Vietnam | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
| Virgin Islands | mostly hilly to rugged and mountainous with little level land |
| 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 |
| Wallis and Futuna | volcanic origin; low hills |
| West Bank | mostly rugged dissected upland, some vegetation in west, but barren in east |
| Western Sahara | mostly low, flat desert with large areas of rocky or sandy surfaces rising to small mountains in south and northeast |
| World | the greatest ocean depth is the Mariana Trench at 10,924 m in the Pacific Ocean |
| Yemen | narrow coastal plain backed by flat-topped hills and rugged mountains; dissected upland desert plains in center slope into the desert interior of the Arabian Peninsula |
| Yugoslavia | void |
| Zambia | mostly high plateau with some hills and mountains |
| Zimbabwe | mostly high plateau with higher central plateau (high veld); mountains in east |
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