Eleven converging rows of menhirs stretching for . There is what may be the remains of stone circles at either end. According to the tourist office there is a "cromlech containing 71 stone blocks" at the western end and a very ruined cromlech at the eastern end. The largest stones, around high, are at the wider, western end; the stones then become as small as 0.6m high along the length of the alignment before growing in height again toward the extreme eastern end.