Located in the Monts d’Arrée, in the heart of the Armorique Natural Park, the Yeun Elez is a swamp considered in Breton legends as the Gateway to Hell.
According to the legend reported by Anatole Le braz, it is the place where the evil souls who haunted the living were thrown into hell. Tadic-Coz knew the secret and the ritual of locking souls of ghosts in the body of a black dog. He instructed young Jobic to guide the dog towards the underworld gates. The latter, going from presbytery to presbytery, led the black dog to the rector of Commana. Together, at sunset, they threw the black dog into the Yeun Elez swamp, condemning the ghost to hell.