Trouville-sur-Mer, commonly referred to as Trouville, is a city of 4,603 inhabitants in the Calvados department in the Normandy region in no…Trouville-sur-Mer, commonly referred to as Trouville, is a city of 4,603 inhabitants in the Calvados department in the Normandy region in northwestern France. Trouville-sur-Mer borders Deauville across the River Touques. This fishing-village on the English Channel became a popular tourist attraction in Normandy from the 19th century. Its long sandy beach earned then the nickname of "queen of the beaches" or "most beautiful beach in the world".