This really is a lovely setting. Two burial chambers sit on a bed of stones in the shade of the trees and from their elevated position the sea is visible down below.
The village of Dyffryn Ardudwy is on the coast road, half-way between Harlech and Barmouth and the cairn is accessed by a sign-posted path at the southern end of the village.
The smaller, portal dolmen was built first. This is a typical dolmen shape with a heavy capstone resting on two portal stones and sloping down towards the rear. A closing slab acted as a door that sealed the entrance and after that, deposits were probably place inside through gaps in the sides and at the southern end of the tomb.
I’ve since read that there’s a small cup mark on one of the portal stones but I didn’t see it at the time.
Some time after the first tomb was built, a larger tomb was built to the east of it and then a monumental cairn was built which incorporated both tombs. There’s plenty of the cairn material left on the ground to give a good idea of the size of the extended cairn.
Fragments of Neolithic pottery were found in the older tomb and both Neolithic and Bronze Age pottery was found in the later one.