Although hailed as one of the most important megalith sites in France, this seems to be relatively unknown. We only found out about it through a sentence in a guide book of Brittany.
The site is on the D776 a mile or so NW out of Monteneuf towards Guer (which is about 40k SW of Rennes)
It is right by the road side and you can't miss it.
There is a huge car park on the other side of the road and a map showing walks through the woods and local area.
The stones were only rediscovered 30 odd years ago when a forest fire revealed them.
Only a handful of the 400+ stones were still standing and since then many have been re-erected.
It is difficult to make sense of the site - there are just so many stones here, and while my mind tried to sort it out into this line and that line, my feelings were running away with themselves. This is an awesome place!
The visitor centre was not open when we were there (mid June) but there are some interpretive boards around and about. It seems like this is an ongoing project of discovery for the French archeos.
There seems to be many more stones/ dolmens in the surrounding woodlands.
I reckon this has to be one of the must visit sites in Brittany - and if you do go allow plenty of time for wandering and discovering.
"This site has more than 420 stones is considered one of the most important of Central Brittany. Its construction dates back to more than 1,500 years. In 1989, after excavations, the majority of the standing at half-buried in the Heath there was discovered. The site extends over 7 hectares. Some stones weighing over 35 tons and can measure up to 5 meters"
Aubrey Burl has 22 schist stones (with three still standing) in two intersecting rows 55m N/S and 78m WSW/ENE [rather ragged on his plan]