e Group is granitic, narrow coastal strip, rocky,
hilly; others are coral, flat, elevated reefs

Sierra Leone
coastal belt of mangrove swamps, wooded hill country,
upland plateau, mountains in east

Singapore
lowland; gently undulating central plateau contains water
catchment area and nature preserve

Slovakia
rugged mountains in the central and northern part and
lowlands in the south

Slovenia
a short coastal strip on the Adriatic, an alpine mountain
region adjacent to Italy and Austria, mixed mountains and valleys
with numerous rivers to the east

Solomon Islands
mostly rugged mountains with some low coral atolls

Somalia
mostly flat to undulating plateau rising to hills in north

South Africa
vast interior plateau rimmed by rugged hills and narrow
coastal plain

South Georgia and the South Sandwich Islands
most of the islands,
rising steeply from the sea, are rugged and mountainous; South
Georgia is largely barren and has steep, glacier-covered mountains;
the South Sandwich Islands are of volcanic origin with some active
volcanoes

Southern Ocean
the Southern Ocean is deep, 4,000 to 5,000 m over
most of its extent with only limited areas of shallow water; the
Antarctic continental shelf is generally narrow and unusually deep,
its edge lying at depths of 400 to 800 m (the global mean is 133 m);
the Antarctic icepack grows from an average minimum of 2.6 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 is the world's
largest ocean current, transporting 130 million cubic meters of
water per second - 100 times the flow of all the world's rivers

Spain
large, flat to dissected plateau surrounded by rugged hills;
Pyrenees in north

Spratly Islands
flat

Sri Lanka
mostly low, flat to rolling plain; mountains in
south-central interior

Sudan
generally flat, featureless plain; mountains in far south,
northeast and west; desert dominates the north

Suriname
mostly rolling hills; narrow coastal plain with swamps

Svalbard
wild, rugged mountains; much of high land ice covered; west
coast clear of ice about one-half of the year; fjords along west and
north coasts

Swaziland
mostly mountains and hills; some moderately sloping plains

Sweden
mostly flat or gently rolling