Ridges are areas of the beach that are raised. The dips are water-filled troughs called runnels.

Ridge and runnels on Harlech beach, North Wales.

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The beach is the area between the lowest spring tide level and the point reached by the storm waves in the highest tides.

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A sand dune is a small ridge or hill of sand found at the top of a beach, above the reach of the waves.

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Offshore bars form when sediment is transported on and off a beach. Destructive waves remove sediment from the beach and form the offshore bar.

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Beaches, sand dunes, spits and bars.

Find out more about landforms of coastal deposition.