That paradox is at the core of what makes this small site worth pausing over. A boundary cairn is, at its most basic, a heap of stones placed deliberately to mark the edge of one territorial unit and the beginning of another, a physical punctuation mark in a landscape. This particular one sits on the townland boundary between Knocknagalty and Drumleagh in County Limerick, and for all the centuries it presumably served its purpose, it has now been reduced to an absence.

The historical record preserves what the ground no longer shows. The Ordnance Survey Ireland six-inch Cassini edition map depicted the feature as a small circular-shaped mound, and by the time the 25-inch edition was produced in 1897, the cartographers annotated it simply as 'Mound', suggesting that even then the original purpose or identity of the feature was uncertain enough to warrant only a vague label. Two related boundary cairns, recorded under the references LI050-032 and LI050-034, lie 80 metres to the west and 150 metres to the east respectively, indicating that this ridge carried a meaningful territorial line, marked at intervals by accumulated stone. Between those neighbouring features, this central cairn completed the sequence. Digital Globe orthoimagery captured between 2011 and 2013, as well as Google Earth imagery from the same period, showed no surface remains at all.

For anyone walking the Galty ridge, the precise location sits in rough pasture on the high ground between the two peaks, where the townlands of Knocknagalty and Drumleagh meet. There is nothing to see in the conventional sense, which is itself the point. The two flanking cairns nearby may offer more by way of visible presence, and taken together the three features read as a line rather than isolated curiosities. The terrain is exposed and can be wet underfoot, so appropriate footwear and attention to weather conditions matter more here than the monument itself. The site was compiled in the Irish national record by Fiona Rooney, with the entry uploaded in November 2021.