The Môle des Noires jetty – 520 metres long – juts out into the bay of Saint-Malo from the Saint-Philippe bastion. Built in granite, it takes its name from the “Roches Noires” (black rocks) on which it was built between 1837 and 1842 and extended in 1930. Its role is to protect the outer harbour and to serve as a breakwater during high tides. In addition, the dyke offers protection against the wind to the Môle beach, the most sheltered in Saint-Malo. At the end of the breakwater, a 9-metre high turret, topped by a lantern, offers a panoramic view of the port, the old town and its ramparts, Dinard and the islands of Harbour and Cézembre.