Soulac-sur-Mer, commonly known as Soulac, is a commune in the department of Gironde, administrative region of Nouvelle-Aquitaine, …Soulac-sur-Mer, commonly known as Soulac, is a commune in the department of Gironde, administrative region of Nouvelle-Aquitaine, France. It's a seaside resort on the Côte d'Argent, on the peninsula of Médoc, 12 km from Royan and 86 km from Bordeaux.