It is not large, measuring roughly 4.45 metres east to west and 4 metres north to south, and rising only about 0.7 metres from the ground. But its deliberately circular form, the mixed sizes and shapes of the stones that make it up, and the faint traces of kerbing still visible along its east-west axis all point to something intentional. A cairn of this kind, a mounded heap of stones typically raised over a burial or as a landscape marker in prehistoric times, rarely announces itself dramatically. This one does not try to.

What gives the site its particular character is that it does not stand alone. Two further cairns lie within 28 metres, one to the west and one to the southwest, forming a loose cluster on the same ridge. Groupings like this are not uncommon in the Irish upland landscape, where cairns were sometimes arranged in relation to one another, perhaps marking territory, commemorating the dead over successive generations, or simply reflecting a tradition of return to a place already considered significant. The Lounaghan trio sits in south-west Kerry, a part of the country where prehistoric monument density is notably high, and where the terrain itself, ridgelines, streams, and exposed slopes, seems to have shaped where people chose to leave their marks.