The elevation of an object in relationship to a given plane, often sea level.
What is altitude?
A gap in a mountainous area suitable for passing through; a means of passage through a rugged area.
What is a pass?
An area drained by a river and its tributaries, a watershed.
What is a drainage basin?
A soft, wet ground covered with grass or other plants, too soft to bear a man.
What is a bog?
A row of mountains.
What is a mountain range?
A flat-topped mountain with steep walls.
What is a mesa?
A smaller stream running into a larger one or proceeding from it.
A ring-shaped coral reef, island, or set of small islands nearly or completely surrounding a lagoon.
What is an atoll?
A place where the water is shallow or of little depth; a sand bank or bar; a shallow.
What is a shoal?
A long or continued range of hills or mountains; the upper part of such a range.
What is a ridge?
A natural elevation of land; a mass of earth rising above the common level of the surrounding land.
What is a hill?
An artificial cut or passage for water used for transportation.
What is a canal?
A hollow place for water; an enclosed part of water, forming a broad space within a strait or narrow entrance; a little bay.
What is a basin?
A soggy, swampy, slow-moving body of water, obstructed by vegetation.
What is a bayou?
A chain or range of rocks lying at or near the surface of the water; a cay.
What are keys?
A high bank, almost perpendicular, projecting into the sea.
What is a bluff?
A long, narrow passage of water; a creek.
What is an arm?
What is a lagoon?
A tract of low land, very wet and miry and overgrown with coarse grass.
What is a marsh?
A body of water interspersed with many isles.
What is an archipelago?
The top of a hill or mountain, ending in a point.
What is a peak?
What is a ford?
A place where water is collected and kept for use when wanted.
What is a reservoir?
What is a moor?
A chain or range of rocks, lying at or near the surface of the water.
What is a reef?