Courseulles-sur-Mer, commonly known as Courseulles, is a commune in the Calvados department, Normandy, northwestern France. Until 195…Courseulles-sur-Mer, commonly known as Courseulles, is a commune in the Calvados department, Normandy, northwestern France. Until 1957, the town's name was simply Courseulles. It lies 3 km west of Bernières-sur-Mer and 18 km north of Caen.