An offshore bar is a raised area of seabed that is found offshore.

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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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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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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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A spit is an extended stretch of beach material that sticks out to sea and is joined to the mainland at one end.

Aerial view of Spurn Point from the mouth of the Humber Estuary

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