St Malo (Sang Ma-lo'), a seaport of Brittany, dep. Ille-et-Vilaine, on the Rance estuary, 51 miles NNW. of Rennes. The old town clusters all over a rocky islet that is surrounded with walls and connected with the mainland by a narrow causeway. Forts and batteries crown several rocks lying off the town, and the defences are completed by an old castle. The harbour is safe, but difficult of approach; the tides sometimes rise 50 feet, and storms dash over the top of the battlements. About the end of the 17th century the people of this town reaped large fortunes by privateering in the English Channel, and the port was the headquarters of the French East India Company. St Malo exports potatoes, buck-wheat, barley, butter, eggs, and fruit, and imports coal, timber, pitch, and iron. There are a quondam cathedral and a museum. St Malo was the birthplace of Chateaubriand, Maupertuis, Lainennais, Lamettrie, and the sailors Duguay-Trouin, Cartier, and Labourdonnais. Dinard (q.v.) is across a small stream; St Servan (q.v.) across the Rance estuary. Pop. 9460.