Boulogne-sur-MerBoulogne-sur-MerCountryFranceRegionHauts-de-FranceBELGIUMBRITIOGERMANYSPAINITALYAtlanticDEC White MountainDEC ParisDEC MarseilleDEC Boulogne-sur-Mer Boulogne-sur-Mer (france: Boulogne-sur-Mer) is a northern city France.This article is still a stub and needs your attention.Please add a sketch and additional content. Be brave and improve it.