Gouffre de la Pierre Saint-Martin

The Gouffre de la Pierre Saint-Martin, also called Gouffre Lépineux , is the original entrance to a major cave system located in the massif of La Pierre Saint-Martin (massif de la Larra-Belagua to the Spaniards), in the immediate vicinity of the Franco-Spanish border and the French commune of Arette, in the Pyrénées-Atlantiques in the Nouvelle-Aquitaine region, under which lies part of the cave network.