Beaulieu-sur-Mer, commonly referred to simply as Beaulieu, is a seaside commune on the French Riviera between Nice and the Principality of …Beaulieu-sur-Mer, commonly referred to simply as Beaulieu, is a seaside commune on the French Riviera between Nice and the Principality of Monaco. Located in the Alpes-Maritimes department in the Provence-Alpes-Côte d'Azur region, it borders the communes of Saint-Jean-Cap-Ferrat and Villefranche-sur-Mer, not far from Èze to the northeast. In 2018, Beaulieu-sur-Mer had a population of 3,731. Its inhabitants are called Berlugans and Berluganes.