3 km long, the biggest sand beach in Saint-Malo. The Dyke is 1671m long and goes along the beach proposing a beautiful walk bordered by various villas built at the end of the 19th century. An alignment of breakwaters protects the dyke against the strength of the waves. Set up at the beginnings of the 19th century after an idea of the engineer Ponts and Chaussées Robinault from Saint-Servan, the oak-tree breakwaters are fixed at a depth equal or bigger than the altitude they have at the surface.