Located at the end of the Pyrenees mountain range, the nine kilometres of rocky coasts and beaches of the bay form a remarkable and fragile landscape. The coastline, born of the convergence then the collision of the Iberian and European plates, is marked by the presence of rocky outcrops of great recumbent folds called chalky clayey flyschs, i.e. sequences of hard chalky layers and soft clayey layers. The fragility of this system plays a part in the receding of the coastline.
