To reach the starting point from Quimperlé, follow the D49 southwards, enter the forest and then, at the junction with the column, turn left onto the Route Forestière du Château and park in the car park a few metres further on.
(S/E) Continue along the road and, at the 90° left-hand bend, go straight on along the Route Forestière de l’Abbaye Saint-Maurice.
(1) At the three-way junction, turn right towards the Étang des Tailleurs.
(2) At the pond, cross the bridge then head up the Frout valley on the right. At the Ligne de la Fontaine Oliveau, continue to the left until you reach a three-way junction with a small car park.
(3) Turn right towards the Kerguéguen Stele, cross a clearing, reach the low Iron Age stele, then head for the Ligne des Grands Buis.
(4) Head down to the left towards the Fontaine au Loup (Feteun ar Bleiz). Ignore a path branching off to the right, then continue along the valley floor until you reach a fork at the Pont de Pierre (formerly the Pont du Diable).
(5) Cross the bridge and continue along the Ligne de la Fontaine Oliveau until you rejoin the route you have already taken.
(1) Go straight on and head for the car park on the edge of the Route Forestière du Château (S/E).