Barfleur, a small seaport of north-western France, overlooking the Bay of the Seine, in the department of Manche, 22&FRAC12; m. N.N.E. of Valognes by rail. Pop. (1906) 1069. In the middle ages Barfleur was one of the chief ports of embarkation for England. In 1120 the "White Ship," carrying Prince William, only son of Henry I., went down outside the harbour. About 2 m. to the north is Cape Barfleur, with a lighthouse 233 ft. high.