The choronym 'Côte d'Émeraude' (Emerald Coast) was invented in 1890 by the Malouin lawyer and historian Eugène Herpin (1860-1942) to designate the coast of the bay of Saint-Malo because of the emerald green color of the sea. This coast made up of beaches, rocks, islands, reefs and coastal banks did not have a specific name. It was named after the model of the Côte d'Azur (French Riviera) to accompany the development of seaside tourism in the region at the end of the 19th century. Located in northeastern Brittany, straddling Ille-et-Vilaine and Côtes-d'Armor, it stretches from Pointe du Grouin in Cancale to the east to Cap Fréhel in Plévenon to the west and notably covers Saint-Malo, the Rance estuary and Dinard (photo).