It is recorded, classified, given a reference number, and assigned a probable date range, yet when you go looking for it, there is nothing to see. That particular quality, of an absence that has been formally documented, gives this site a quietly peculiar character among the archaeology of the region.

The cairn at Cabragh is the most northerly of a series of ten cairns that together trace a long linear boundary between the townlands of Cabragh and Gortakeeran. A cairn used in this way is essentially a landmark built from heaped stone, placed at intervals to make a boundary legible on the ground, readable by anyone who needed to know where one community's land ended and another's began. What makes this particular chain of markers interesting is its absence from the 1837 edition of the Ordnance Survey six-inch map, the great early nineteenth-century survey of Ireland that recorded field boundaries, ruins, and even minor earthworks with considerable care. If none of the ten cairns appear on that map, it suggests they were either already gone by that point, or perhaps were never substantial enough to register. Their probable date is given as post-1700 AD, placing them in the period of early modern landholding and agricultural organisation rather than in prehistoric ritual use. The bog that covers these slopes may have consumed what little stone was ever piled here, or the cairns may have been dismantled as the boundary they marked became fixed by other means, written agreements or stone walls rather than heaped rubble on a hillside.

What remains is the record of a boundary, a system of ten points stretching across upland Sligo, most of them equally invisible now, each one a small notation in the long negotiation between neighbouring communities over where one place ended and another began.