a slowly moving mass of ice
glacier
a submerged ridge of rock or coral near the water's surface
reef
a large mass of land projecting into a body of water
peninsula
a large cave or a large chamber in a cave
cavern
a long narrow inlet of the sea between steep cliffs
fjord
a cylinder of calcium carbonate hanging from a cave roof
stalactite
an open and small valley in a hilly area
dale
a ridge of sand created by the wind
dune
arid land with little or no vegetation
desert
a narrow strip of land connecting two larger land areas
isthmus
a low area where the land is saturated with water
wetland
a large frozen mass floating at sea
iceberg
a steep high face of rock
cliff
the shore of a sea or ocean
coast
simple plateau, a relatively flat land
plain
an indentation of a shoreline smaller than a gulf
bay
a triangular area of alluvial deposits where a river divides
delta
a long depression in the surface of the land
valley
a cylinder of calcium carbonate projecting from a cave floor
stalagmite
a body of (usually fresh) water surrounded by land
lake
an extensive plain without trees
steppe