Visited 15.09.23
Allee Couverte de Grah-Niol is located on a narrow lane on the Northern edge of Arzon. There is convenient parking 50m N of the site. There is a low fence round the allee-couverte denying any internal access. This is unfortunate as there are carved stones inside the passage of the monument. A standing stone is erected on the E end of Allee Couverte de Grah-Niol, on the roadside.