For hikers, in the department of Ille-et-Vilaine, the Côte d'Émeraude (the Emerald Coast) and the Bay of Mont Saint-Michel are the eye-catchers. The GR34, the sentier des douaniers, is perhaps the most famous coastal path in France. In Ille-et-Vilaine, the GR34 runs from Lancieux to Plestin-Les-Grèves. The valley of the Rance is one of the most characteristic estuaries of the entire region. At low tide you can see vast plains here, but at high tide this place resembles a estuary. From Dinan to Dinard and Saint-Malo, all along the banks of the river, the walks are worthwhile. You will discover picturesque villages and beautiful shipowners' houses here.