The lines marking Aghavoghil, Conwal South, Leckanarainey, and Cullionboy meet at a single point, and at that point sits a modest pile of stones, roughly one and a half metres across and just thirty centimetres high. It is the kind of thing you could step over without noticing, yet its position is anything but accidental.

Boundary cairns like this one were a practical technology of rural Ireland, placed at contested or ambiguous points in the landscape to make agreements legible to anyone who needed to know where one holding ended and another began. This particular cairn appears on the 1910 edition of the Ordnance Survey six-inch map, where it is noted in the careful italic lettering the surveyors reserved for antiquities and features of local significance, described simply as a "Pile of Stones". That it was already worth marking suggests it had been sitting at this junction long enough to be considered a reliable fixture. A second cairn lies approximately 130 metres to the north, hinting that this corner of Conwal was once more carefully demarcated than the quietly overgrown slopes might now suggest.