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Sand dunes are formed where a large area of sand is exposed at low tide. The sand dries in the sun and wind blows it on-shore where it is trapped by vegetation. The dune system grows as fresh sand is trapped on the dunes nearest the beach. The habitat becomes progressively more stable away from the shore. Large, multiple-ridge dune systems are formed on the west coast by the prevailing westerly winds eg Braunton Burrows in north Devon, Whiteford on the Gower Peninsula and Formby and Ainsdale on Merseyside. On the east coast, narrow systems form where the dune building easterly winds are balanced by the prevailing south westerlies such as at Druridge Bay in Northumberland. >
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