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Gulf of Saint-Malo, gulf of the English Channel indenting the north coast of Brittany, France. The Gulf of Saint-Malo extends from the island of Bréhat (west) to the peninsula of Cotentin of Normandy (east). It is 60 miles (100 km) wide from east to west and 20 miles (32 km) long from south to north and receives the Trieux, Rance, Couesnon, and Sélune rivers. The gulf includes the bays of Saint-Brieuc and Mont-Saint-Michel, site of...