The GR®52 long-distance hiking trail crosses the Alpes-Maritimes and the Mercantour National Park, passing through the archeological zone of the Mont Bégo engravings (Vallée des Merveilles), classified as a Historic Monument since 1989.
On the Riviera Française, the GR 52 links Menton to Sospel, overlooking the villages of Castellar and Castillon. From Sospel, the GR 52 continues towards the Vallée des Merveilles. From Sospel, the other GR, 52A, heads for Breil and La Brigue, in the Roya Valley.
We strongly advise you to follow the signposts that line all the Grande Randonnée® trails (in white and red), and to bring a topoguide available from the Menton, Riviera & Merveilles Tourist Office.