The menhirs of Brittany are large, mostly single monoliths that were erected by the people of the megalithic culture and partly overturned again or found other uses.
The pottery found dates this tomb to around 2500 and 3500 BC. This tomb with a side entrance, more than 15 meters long, was very degraded. It is 15 meters long and is a real spectacle.
Magnificent view point on the banks of the Vilaine as well as Saint Malo de Phily. However, be careful with the descent following the GR which can be perilous in wet weather (Large difference in altitude)
We can observe an unconformity between rocks coming from two geological periods (Brioverian and Ordovician). To get there, follow the sign from the road, keep to the left of the path (private property).