They are not burial monuments or ceremonial markers in any obvious sense. They are, most likely, the accumulated result of generations of farmers dragging stones out of thin soil to make fields workable, piling them up where they stood rather than carting them away. Clearance cairns, as they are known, are among the most modest and most honest of archaeological features: pure accumulation, labour made visible.

The broader settlement complex at Canroe is a dense one. Eight houses, eight animal shelters, two poorly built subsidiary structures, and an extensive network of field walls crowd the high ground and spill down to the rocky shoreline to the east. At the western end of the island, an iron smelting site points to a community doing more than subsistence farming. The cairns were investigated by the archaeologist M. J. O'Kelly in the early 1950s, as part of a wider excavation of the Canroe complex. One well-preserved example, lying some 55 metres north-east of what was recorded as House 6, was fully excavated. It measured 3.5 metres in diameter and half a metre high. No finds were recovered from it, which is itself informative: there was nothing buried, nothing deposited, nothing commemorated. It was just stones, cleared and stacked, the quiet residue of someone making ground productive on a small island off the southwest coast of Ireland.

At certain low tides, a sand-bar at the south-eastern tip of Beginish connects the island with the nearby Church Island, making the geography feel provisional, as though the sea is still deciding what belongs to what. Fourteen of the fifteen cairns cluster on the eastern side of Canroe, with one sitting closer to the houses on the western slope, suggesting the clearance work followed the same logic as the settlement itself, spreading from the habitable centre outward.