panorama of the fortifications of the citadel of the château d`oléron

039 aquitaine archipelago architecture arsenal arvert atlantic bastion bay biscay blue bridge building chacent charentais charente church citadel coureau cultural downtown europe fortification france high historical holidays ilacent island low maritime maumusson moat new ocean olacopy olerun panorama patrimony peninsula pertuis port ron saintpierred sea sky stones strategic strong stronghold summer teau tide travel vauban walk walls