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body of water

A body of water or waterbody is any significant accumulation of water on the surface of the earth.

topography

Topography is the study of forms and features of land surfaces. The topography of an area may refer to landforms and features themselves, or a description or depiction in maps.

archipelago

A group or chain of islands clustered together in a body of water.

sediment

Particles of soil, sand, and minerals that settle at the bottom of a liquid, often found in bodies of water.

reef

A ridge of rock or coral that rises to or near the surface of a body of water, often providing habitat for marine life

coral

a hard substance that is red, pink or white in colour, and that forms on the bottom of the sea from the bones of very small creatures

ridge of rock

A ridge of rock is a long, narrow, elevated landform that rises above its surroundings, typically with steep sides sloping away from a central crest