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
Sint Maarten
low, hilly terrain, volcanic origin
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 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