Les Authieux-sur-le-Port-Saint-Ouen () is a commune in the Seine-Maritime department in the Normandy region in northern France. Geography A farming and forestry village situated by the banks of the river Seine, some south of Rouen, at the junction of the D7, D13 and the D91 roads. Population Places of interest The church of St.Saturnin, dating from the thirteenth century. A 300m long cave in a hillside. See also Communes of the Seine-Maritime department References External links Official website of the commune Communes of Seine-Maritime