What makes it quietly odd is its shape and its relationship to the ground around it. The building is not freestanding; it presses against the inner face of what may be an older enclosure, borrowing that earlier boundary as part of its own fabric. Collapsed stone from the enclosure wall now litters the interior, so the ruin contains, in a literal sense, the remains of whatever came before it.

The structure measures roughly five metres on its longer axis and four metres on the shorter, and its surviving walls are low, between half a metre and sixty-five centimetres in height depending on which face you measure, with an overall thickness of nearly two and a half metres in places. That substantial girth suggests the walls were once considerably taller, and there is evidence that the upper courses were rebuilt at some point, indicating the building had more than one phase of use or repair. The date is uncertain, though it is thought to be possibly eighteenth century in origin. A natural depression a few metres to the west of the building collects storm water, and rock armour has been laid along the adjacent shoreline, a reminder that this part of Tawin Island has long been exposed to coastal pressure. The island sits in the inner reaches of Galway Bay and is accessible by a causeway, though it remains sparsely inhabited and largely given over to commonage, the kind of shared grazing land that shaped rural Atlantic communities for generations.