I noticed another 'ancient monument' symbol on the map, not far from where we were at Treguier, but I had no instructions as to how to get there or indeed what was there. But we took the chance and went anyway. Happily, we picked up a signpost. As we parked, the heavens opened, but after the deluge we had suffered for most of the day this failed to move us; our shoes and trousers were already soaked to the thigh.
After walking through the dunes and the gorse out towards the sea we finally stumble across this allée couverte. It's a bit trashed but its location is simply lovely overlooking the wide expanse of the estuary. Had it not been so wet, I could sat here for the rest of the day.
It had bigger, thicker stones than all the other allée couvertes we'd seen today further to the west.