Park on the forest road in the hamlet of Le Mélézin.
(S/E) Stay on the road and look for the wooden sign pointing to Le Mélézin. A track branches off from this sign, leading to two chalets. Take this track, pass two half-buried green cisterns and continue along this track, known as the Sentier du Canal du Mélézin. Start with a steep climb that gradually levels out. Stay in the forest, reach its edge and enter the mountain pasture.
(1) Continue along a virtually flat path until you reach a new climb in a wide, flat area.
(2) Continue along the well-marked path until you reach the Plan du Vallon signpost. Carry on, skirting a small hillock, to reach Lac du Plan Vallon.
(3) Follow the same route back to return at a leisurely pace to the car park on the road in the hamlet of Mélézin (S/E).