h volcanic, rocky, rugged mountains
in interior

San Marino:
rugged mountains

Sao Tome and Principe:
volcanic, mountainous

Saudi Arabia:
mostly uninhabited, sandy desert

Senegal:
generally low, rolling, plains rising to foothills in
southeast

Seychelles:
Mahe 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 mountain 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 meters
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 meters (the global
mean is 133 meters); the Antarctic icepack grows from an average
minimum of 2.6 million square kilometers in March to about 18.8
million square kilometers 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 east and west

Suriname:
mostly rolling hills; narrow coast