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Access: From the N137 (Rennes–Nantes), take the Poligné exit and then follow the D47 towards Pancé.
Park near the ‘Forêt du Tertre Gris’ sign (4 to 5 spaces).
(S/E) With your back to the car park, take a path leading downhill, which is lined in places by a rustic handrail. Along the way, you’ll regularly come across information boards.
At the first junction, marked by the remains of an old fallen tree trunk, take the left-hand path. Continue downwards, following a rustic flight of steps, to reach a quarry face (information board).
(1) Take a short round trip to the cliff to see the remains of an ampelite vein (pyrite-bearing schist with a high proportion of organic matter, which gives it its black colour). Continue down to reach the River Sennon, a tributary of the Vilaine. Turn left and follow the river upstream. This wide, flat path runs alongside the cliff face, where you can see the black rock. You will come to an information board about a tunnel dug by hand to explore the subsoil and determine whether an ampelite vein was present. It stretched for several tens of metres, but rockfalls have partially filled it in and blocked it.
(2) At the three-way junction in the path, take the path leading uphill to the left, leaving behind another path that continues along the river. Follow this path, which runs below the “Jeannot Haguennier” open-air theatre.
(3) Turn right to reach the Passage des Asphodèles. At the road, turn right towards the centre of the village of Pancé. Walk past the pretty town hall, reach the church, then turn back, following the path on the right-hand side. Walk past the sports ground, cross the D37 and walk past the top of the open-air theatre. Continue on to reach the viewpoint. Carry on along the path that descends to the next junction.
(4) Take the path on the left, which continues downhill. This path cuts diagonally through a pine forest, part of which burnt down in April 2009. This section of the route is more challenging as the relatively steep path runs halfway up the slope.
Rejoin the path you took on the way up just before the cutting face. Turn right and climb the steps you took on the way up. At the final fork, make sure to take the path marked by the fallen tree trunk. Continue climbing until you reach the car park (S/E).
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