This one, in reclaimed pasture at Tankardstown in County Limerick, is visible only from the air, and even then only under the right conditions. It exists, for most practical purposes, as a circular smudge in a crop, a faint signature left in the soil that the ground itself has otherwise swallowed entirely.

The site came to light not through any planned excavation or antiquarian survey, but as a byproduct of infrastructure work. On 3 November 1984, aerial photographs were taken at a scale of 1:5000 during the routing of a Bórd Gáis Éireann gas pipeline, reference number 040246. Analysts examining those images noticed a small circular cropmark, the kind of subtle discolouration that appears when buried features, a filled ditch perhaps, or the compressed remains of an earthen mound, affect how overlying vegetation grows and drains. A cropmark is, in essence, a crop reading the archaeology beneath it, growing taller or shorter, greener or more stressed, depending on what lies below. This particular mark placed the site in the north-east quadrant of a wider complex that includes a group of barrows and an enclosure. Barrows are prehistoric burial mounds, typically circular, raised over one or more interments, and they are found across Ireland in varying states of survival. The records assign this one several monument numbers, situating it among neighbouring features catalogued separately. It does not appear on any Ordnance Survey Ireland historic mapping, and aerial photography taken between 2005 and 2012 shows no surface remains whatsoever. The record was compiled by Fiona Rooney and uploaded in May 2021.

For anyone hoping to visit, the honest position is that there is nothing to see at ground level. The field is reclaimed pasture, and the monument survives, if it survives at all, as subsurface archaeology rather than landscape feature. The cropmark recorded in 1984 remains a possible identification rather than a confirmed one, and its visibility on Google Earth imagery is similarly tentative. What is perhaps most interesting about this site is precisely that quality of near-absence: the monument is known almost entirely through a single photographic mission flown nearly forty years ago, and its existence as part of a broader barrow group makes it significant in aggregate even where individual remains are indistinct.