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

Find out more about sand dunes.

Beaches, sand dunes, spits and bars.

Find out more about landforms of coastal deposition.

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

Find out more about landforms of coastal deposition.

A sandy beach is usually formed in a sheltered bays, where low energy, constructive waves transport material onto the shore.

Find out more about landforms of coastal deposition.

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.

Find out more about landforms of coastal deposition.