Park at the free car park at La Planche des Belles Filles.
(S/E) Head north-east until you reach a small crossroads (altitude 996).
(1) Continue straight ahead along the GR®533, marked with a Green Rectangle, and follow the north-western flank of the Ballon Saint-Antoine to reach an unnamed pass at the foot of the Tête de Demesy.
(2) Turn right and follow the path marked with a Green Triangle leading to the Étang des Belles Filles.
(3) Walk along the left bank of the lake and take a path marked with a Red Disc, heading towards the Planche des Belles Filles ski resort. This hillside path leads back to the junction where you started.
(1) Turn left to return to the car park (S/E).