The Le Rocher site at Le Bono consists in a large, angled dolmen beneath a very well-preserved tumulus 35 metres in diameter, comprising a core of stones covered with a thick layer of earth and a top layer of granite stones. Its angled dolmen marks it out among the megalithic monuments in the area; this is a rare type of architecture, of which a few other examples exist in southern Morbihan, notably a second monument with the same plan that lies virtually opposite: the Pointe de Vide-Bouteille dolmen at Crach, on the other side of the Auray river.
Several of the slabs are engraved with similar symbols to those on the Pierres Plates dolmen at Locmariaquer.
A listed historic monument since the late nineteenth century, the tumulus lies in a clearing at the middle of a pine wood, managed by the Département as a listed Environmentally Sensitive Area.
A footpath leads to the site from the car park to the north. There are several Iron Age small tumuli close to the tumulus; these are also of great archaeological interest and themselves listed historic monuments.
©FanchGalivel/PaysagesdeMégalithes
©FanchGalivel/PaysagesdeMégalithes