Known locally as Buaile Glas, it is an old burial place, and its modest scale belies a quiet complexity. The cairn, an oval accumulation of stone running roughly northeast to southwest, stretches more than twelve metres in length and rises only about a metre from the ground. What makes it worth pausing over is the detail that emerges on closer inspection: small upright slabs arranged across its surface, some of them forming what appear to be rectangular settings, the outlines of individual graves worked out in stone.

A cairn of this kind is essentially a burial mound built from loose stone rather than earth, and the slab revetment visible along its western side and at the southwestern end, meaning upright or leaning slabs used to retain and face the cairn material, suggests this was a deliberately constructed and maintained site rather than a casual accumulation. The northeastern end fades out, possibly because stone was removed over the centuries for other building purposes, a common fate for ancient structures on islands where good building material was always in demand. Robinson, writing in 1980, noted traces of a surrounding wall, which would have marked it out as a defined and bounded place of burial. The combination of the cairn form, the revetment, and the arranged surface slabs points to a site with considerable age, though no precise date is attached to it.