word | | Terrain |
| flat | 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 |
| flat | Turks and Caicos Islands | low, flat limestone; extensive marshes and mangrove swamps |
| flat | United Arab Emirates | flat, barren coastal plain merging into rolling sand dunes of vast desert wasteland; mountains in east |
| flat | 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 ... |
| flat | Vietnam | low, flat delta in south and north; central highlands; hilly, mountainous in far north and northwest |
| flat | Western Sahara | mostly low, flat desert with large areas of rocky or sandy surfaces rising to small mountains in south and northeast |
| flat | 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 |
| floating | Antarctica | ... Peninsula area, and parts of Ross Island on McMurdo Sound; glaciers form ice shelves along about half of the coastline, and floating ice shelves constitute 11% of the area of the continent |
| floating | South Sudan | ... of the country supporting agriculture and extensive wild animal populations; The Sudd (a name derived from floating vegetation that hinders navigation) is a large swampy area of more than 100,000 sq km ... |
| flood | Gambia, The | flood plain of the Gambia River flanked by some low hills |
| flood | Georgia | ... the south; Kolkhet'is Dablobi (Kolkhida Lowland) opens to the Black Sea in the west; Mtkvari River Basin in the east; good soils in river valley flood plains, foothills of Kolkhida Lowland |
| flood | Luxembourg | mostly gently rolling uplands with broad, shallow valleys; uplands to slightly mountainous in the north; steep slope down to Moselle flood plain in the southeast |