Cap-d'Ail is a seaside commune in the Alpes-Maritimes department in the Provence-Alpes-Côte d'Azur region in Southeastern France. Cap-d'Ai…Cap-d'Ail is a seaside commune in the Alpes-Maritimes department in the Provence-Alpes-Côte d'Azur region in Southeastern France. Cap-d'Ail borders the areas of La Colle, Les Révoires and Fontvieille in the Principality of Monaco.