word | | Terrain |
| Siberian | Arctic Ocean | ... clockwise drift pattern in the Beaufort Gyral Stream, but nearly straight-line movement from the New Siberian Islands (Russia) to Denmark Strait (between Greenland and Iceland); the icepack is surrounded by open ... |
| sierra | Ecuador | coastal plain (costa), inter-Andean central highlands (sierra), and flat to rolling eastern jungle (oriente) |
| sierra | Peru | western coastal plain (costa), high and rugged Andes in center (sierra), eastern lowland jungle of Amazon Basin (selva) |
| significant | Cyprus | central plain with mountains to north and south; scattered but significant plains along southern coast |
| Sirdaryo | Uzbekistan | ... 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 ... |
| sixfold | Southern Ocean | ... 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 ... |
| size | Arctic Ocean | ... Iceland); the icepack is surrounded by open seas during the summer, but more than doubles in size during the winter and extends to the encircling landmasses; the ocean floor is about 50 ... |
| slightly | Kuwait | flat to slightly undulating desert plain |
| slightly | 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 |
| slope | 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 |
| slope | Moldova | rolling steppe, gradual slope south to Black Sea |
| slope | 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 |
| slopes | Hong Kong | hilly to mountainous with steep slopes; lowlands in north |
| sloping | Austria | in the west and south mostly mountains (Alps); along the eastern and northern margins mostly flat or gently sloping |
| sloping | Greenland | flat to gradually sloping icecap covers all but a narrow, mountainous, barren, rocky coast |
| sloping | Swaziland | mostly mountains and hills; some moderately sloping plains |
| Slovakian | Hungary | mostly flat to rolling plains; hills and low mountains on the Slovakian border |
| soil | Armenia | Armenian Highland with mountains; little forest land; fast flowing rivers; good soil in Aras River valley |
| soil | Lithuania | lowland, many scattered small lakes, fertile soil |
| soils | 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 |
| Sound | Antarctica | ... southern Victoria Land, Wilkes Land, the Antarctic 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 ... |
| source | Guam | volcanic origin, surrounded by coral reefs; relatively flat coralline limestone plateau (source of most fresh water), with steep coastal cliffs and narrow coastal plains in north, low hills in center, mountains in ... |
| south | Argentina | rich plains of the Pampas in northern half, flat to rolling plateau of Patagonia in south, rugged Andes along western border |
| south | Atlantic Ocean | ... in the northern Atlantic, counterclockwise warm-water gyre in the southern Atlantic; the ocean floor is dominated by the Mid-Atlantic Ridge, a rugged north-south centerline for the entire Atlantic basin |
| south | Austria | in the west and south mostly mountains (Alps); along the eastern and northern margins mostly flat or gently sloping |
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