Park in the car park just before the Chalets de Plan de la Vie.
(S/E) Continue along the wide track, reaching its end and the car park for the Ambin Refuge.
(1) Continue along the path that follows. The climb is easy through the Vallon d'Ambin and leads to the Ambin Refuge.
(2) Keep heading due south along the path to reach the junction where several streams converge; the main stream flows down from Lac d'Ambin, joined on its right bank by the Ruisseau de Côte Chaude and on its left bank by the Ruisseau des Lacs Blancs.
(3) Turn right and tackle a steeper climb. Approach a rock face, go round it and, via a wide right-hand bend, reach Lac Noir shortly afterwards.
(4) Follow the outward route back to the car park at the Chalets de Plan de la Vie (S/E).