Côte d'Opale is the French coast from Calais to Boulogne-sur-Mer. From the coast, England is visible on clear days. The coast is known for its beautiful cliffs such as 'Cape Blanc Nez' and 'Cape Gris Nez'.
Many artists have been inspired by its landscapes, the most famous being the composer Henri Dutilleux, the writers Victor Hugo and Charles Dickens, and the painters Carolus-Duran and Maurice Boitel. (source)
Thank you Mieke!