It is corbelled and lintelled, a construction method using overlapping stones to form an arch without mortar, and it measures roughly 1.3 metres wide and 1.7 metres tall. The wall itself is an unusually substantial piece of stonework, running to about 1.5 metres thick, and the blocked opening is all that remains of a structure once recorded under the name Ballylinaghaun.

The site was noted by a writer identified as Kinahan in 1869, who described it as an 'Ointigh called Ballylinaghaun', a term suggesting some form of dwelling or enclosure of local significance. He also mentioned an underground chamber immediately to the east of the structure. Later investigation suggests this was most likely a natural cave rather than anything purpose-built, and it appears, marked simply as 'Cave', on the first edition of the Ordnance Survey six-inch map of the island. That cave is now closed. Associated with the site is a midden, which is an accumulation of domestic refuse, typically including shell, bone, and ash, left behind by people who lived or worked nearby. Middens are among the more useful indicators archaeologists have when trying to understand how a site was actually used, even when the structures themselves have largely vanished. The area sits on a gentle north-west-facing slope among small fields in the townland of Móinín na Ruaige, a landscape that on Inis Meáin tends to be ancient in its basic layout, shaped by generations of careful division and maintenance.