The dunes are produced by the action of either the river or the sea. Those that were created by the Rhône have mostly been removed in order to free up land for agriculture. The coastal dune system is exposed to storms, and gradually more so as the level of the sea rises. Dunes that are further from the shore enjoy a certain amount of protection, and they do not change position so much, given that they are stabilised by vegetation, in particular tamarisk bushes and pine trees. Despite their arid appearance, dunes contain reserves of fresh water that allow them to support a rich, colourful flora (fiche thématique).
Dunes at Beauduc
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