The Emerald Coast, which extends from east to west from Pointe du Grouin in Cancale to Cap Fréhel in Plévenon, is generally represented by an alternation of rocky points framing dune systems located at the base of these rocky escarpments and constituting the outlet of micro-watersheds, larger mudflats or artificialized rias. Very varied, it alternates exposed and sheltered areas made up of sandy and rocky foreshores, with large rocky complexes and large bays fed by small rivers, not forgetting the archipelagos and outcropping rocky reefs. Consisting of 60% of rocky cliffs, this coastline has only 6% of low coasts composed of mostly sandy materials, as here in the commune of Dinard (Ille-et-Vilaine).