A natural underground chamber in a hillside or cliff.
Cave
A piece of land surrounded by water.
Island
The part of the land adjoining or near the sea.
Coast
An area of land overgrown with dense forest and tangled vegetation, typically in the tropics.
Jungle or rainforest
A large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill.
Mountain
A small, narrow river.
Stream
Arid land with very little or no vegetation.
Desert
A large area of water surrounded by land.
Lake
A strip of land covered with sand, shingle, or small stones at the edge of a body of water, especially by the sea between high- and low-water marks.
Beach
A slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.
Glacier
A steep rock face, especially at the edge of the sea.
Cliff
A very large expanse of sea, in particular each of the main areas into which the sea is divided geographically.
Ocean
A cascade of water falling from a height, formed when a river or stream flows over a precipice or steep incline.
Waterfall