Ouistreham is a commune in the Calvados department in Normandy region in northwestern France. Ouistreham is a small port with fishin…Ouistreham is a commune in the Calvados department in Normandy region in northwestern France. Ouistreham is a small port with fishing boats, leisure craft and a ferry harbour. It serves as the port of the city of Caen. The town borders the mouth of the Canal de Caen à la Mer.