Boulogne-sur-Mer, a French city often shortened to Boulogne, is a coastal gem on the Opal Coast. This northern French city rests at the mouth of the Liane River and holds the distinction of being France's top fishing port, a European leader in seafood processing, and a recognized "City of Art and History" due to its cultural significance. Boulogne-sur-Mer embraces modern advancements as well, with a "City of the Internet" designation for its digital initiatives. Explore the Crypt of the Basilica of Notre-Dame, a historical and architectural marvel, or delve into Boulogne's rich past and culture at the Chateau-comtal Museum.