This ruin is to the east of Aonghas Bridge and marked on the OS map as 'Dunan'. Hardly 1m above the ground, it is about 15m in diameter. Like many of its kind in the island it has been both disturbed and robbed. But enough survives to show a roughly circular chamber about 2m in diameter. A couple of large slabs may be part of the original roofing. Trying to identify an entrance passage is a more than difficult task but some large slabs and boulders on the south-west may give a clue to its former position.