Grand-Couronne is a commune in the Seine-Maritime department in the Normandy region in northern France. A small suburban town with a h…Grand-Couronne is a commune in the Seine-Maritime department in the Normandy region in northern France. A small suburban town with a huge container port and considerable light industry situated by the banks of the river Seine, some 7 miles south of the centre of Rouen, at the junction of the D938, D3 and the D13 roads. The A13 autoroute passes through the southern section of the commune's territory.