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 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 lowlands; mountains in west
Switzerland:
mostly mountains (Alps in south, Jura in northwest)
with a central plateau of rolling hills, plains, and large lakes