The one recorded here is barely knee-high, roughly circular, measuring about 1.9 metres across and half a metre tall, built from a mixture of limestone and sandstone stones of varying sizes. That combination of two different stone types is quietly telling, suggesting either opportunistic gathering from the immediate landscape or, possibly, materials carried from different sources with some intention behind the selection.

What makes the cluster at Ballahacommane particularly interesting is the density of cairns in such a tight space. Within eight metres in any direction, three further cairns have been recorded: one roughly seven metres to the north-east, another about eight metres to the north-west, and a fourth only five metres to the south. A cairn, in its simplest form, is a deliberate mound of stones, and in an Irish context these features can range in purpose from prehistoric burial markers to boundary indicators to more ambiguous ceremonial functions. Whether the four cairns here represent a single phase of activity or accumulated over time is not certain, but their proximity to one another argues against casual coincidence. The site looks south towards Mangerton Mountain, a relationship with the wider landscape that may or may not have mattered to whoever placed these stones.