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The shallow underwater plain that is a Continent's real outer edge

Continental Shelf

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coastal wetlands that form when mud is deposited by tides or rivers.

Tidal Flat

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massive accumulations of limestone created by reef-building organisms with calcite skeletons. Mounds of these skeletons build up over thousands of years.

Reef

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a body of comparatively shallow salt or brackish water separated from the deeper sea by a shallow or exposed barrier beach, sandbank of marine origin, coral reef, or similar feature

Lagoon

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flat or very gently sloping areas of the deep ocean basin floor. They are among the Earth's flattest and smoothest regions and the least explored.

Abyssal Plain

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The sea floor below the break is the continental slope. Below the slope is the continental rise, which finally merges into the deep ocean floor, the abyssal plain. The continental shelf and the slope are part of the continental margin.

Continetial Slope and Rise

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A desert is a landscape or region that receives almost no precipitation.

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An alluvial fan is a fan-shaped deposit formed where a fast flowing stream flattens, slows, and spreads typically at the exit of a canyon onto a flatter plain.

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Produced by the action of a river or stream.

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A lake or lake-like environment.

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Freshery slow-moving waters.

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A usually triangular alluvial deposit at the mouth of a river.

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The shore of a body of water, especially when sandy or pebbles.