It sits on the townland boundary between Ballylopen and Ballyshanedehey, part of a group of six boundary cairns that once marked the edges of these old territorial divisions. A cairn, in its simplest form, is a deliberate pile of stones, often ancient, used across Ireland and Britain to signal something worth remembering, whether that was a burial, a summit, or, as here, the line where one community's land ended and another's began. This one, by the time aerial imaging was carried out between 2011 and 2013, had left no visible trace at the surface.

What makes the site quietly curious is its paper trail, or rather its absence from one. The Ordnance Survey Ireland mapped this part of Limerick at six-inch scale in 1840 and again at twenty-five-inch scale in 1897, and neither edition thought to record it. The cairn only surfaces, so to speak, on the later Cassini edition of the six-inch map, where it is noted simply as a 'Mound', a label that tells you very little and hints at how uncertain its identity must have seemed to whoever added the annotation. That it belongs to a cluster of six boundary cairns is known from the national monuments record, where it carries references linking it to features logged across both Cork and Limerick, suggesting the boundary it once helped to mark ran across a wider landscape than a single county line.

For anyone determined to look, the cairn lies within a conifer plantation on Carron Mountain, which itself sits on the townland margins, making the approach a matter of navigating both dense forestry and somewhat blurred geography. Satellite imagery, as noted in the survey compiled by Fiona Rooney and uploaded in November 2021, shows nothing at the surface, so a visit would be less about seeing something and more about standing in the approximate place where something once was. The surrounding plantation will almost certainly restrict sightlines and make orientation difficult. The value, if there is one, is in the knowledge that this invisible point once mattered enough to mark deliberately, and that the marking itself has now almost entirely gone.