The flat-topped mound, roughly twelve metres across and less than a metre high at its tallest, sits at the exact point where three townlands converge, and where the baronies of Burren and Inchiquin meet. Drystone walls, the kind that define land ownership and territorial division across the Irish countryside, run up and intersect directly on top of the ancient stonework. The people who drew those boundaries were not ignoring the cairn; they were using it, treating a monument likely thousands of years old as a convenient and conspicuous fixed point on the landscape.

Cairns of this type, stone mounds raised over burials or as territorial markers during the Bronze Age or earlier, are common enough across Ireland's uplands, but most exist in a kind of administrative silence, noted on maps but belonging to no particular boundary. This one is different. The meeting of Burren and Inchiquin here is not incidental. The Burren, the great limestone karst plateau to the north and west, begins to assert itself even on Knockanes, and the cairn sits near the southern edge of what the record describes as a semi-karst summit, a landscape of exposed limestone pavement and thin soils that made ancient monuments both easier to build and harder to obscure over time. The cairn has not survived entirely intact. Its western centre has been dug out, leaving a subcircular crater roughly two metres across and sixty centimetres deep, with the displaced stone piled nearby. A separate pyramidal heap of stone sits at the southern edge of the summit, around two metres in diameter and over a metre tall, its relationship to the main cairn not fully explained.

The intersection of those drystone boundary walls directly on the cairn's surface is the detail worth looking for. It is a layering of purposes, prehistoric and post-medieval, that is easy to walk past without registering what it means.