That uncertainty is itself the most unusual thing about it. Most old structures in the Irish landscape, however fragmentary, can be slotted into a recognisable category: a field boundary, a cashel, a souterrain, a kiln. This one resists that. Its function and date remain genuinely unknown.

The structure is a slumped stone bank roughly two metres wide, curving into an arc approximately 6.5 metres across in both directions and open to the west. Sod and heather have crept over the stonework, softening its edges, and the interior feels stony underfoot despite its grassy surface. Immediately in front of the open western side, a low linear feature, possibly the remains of a wall, extends northwestward and appears to run beneath the elongated peat-covered rise that forms the spine of this small patch of higher ground. That turf bank, roughly 25 metres long and a metre high, reads in the landscape as a heather-covered island floating above the flat damp pasture around it. A few stones protrude from its north-western end, though whether they are structural or incidental is unclear. Fifteen metres to the north-west, a disused rectangular ball alley adds another layer of the unexpected. Ball alleys, walled enclosures used for playing a form of handball, were once common features of rural Irish communities, and this one measures roughly nine metres by five and a half metres, now abandoned like everything else on this soggy rise above the cutaway bog.