The Petit train d'Artouste is a narrow gauge tourist railway situated in the French Pyrenees close to the Spanish border, some 55 km (34.2 mi) south of the town of Pau, and within the commune of Laruns. The line runs high above the headwaters of the Gave d'Ossau, and provides access to the Lac d'Artouste, a semi-artificial lake in the mountains at an altitude of nearly 2,000 m (6,562 ft). It is the second-highest railway in France after the Tramway du Mont-Blanc.