This ring-barrow in Coolnashamroge, County Limerick, measures roughly 7.5 metres north to south and 8 metres east to west, a modest circular earthwork of the kind built in prehistoric Ireland as a burial monument, typically consisting of a low central mound enclosed by a ditch and an outer bank. What makes this particular example quietly remarkable is that it cannot be seen on any satellite or aerial image before or since that single survey flight. It does not appear on historical Ordnance Survey maps. It left no trace on orthoimages captured between 2005 and 2013 by either the Ordnance Survey Ireland or Digital Globe. The land, it seems, eventually swallowed it back.

The site was identified during the Bruff aerial photographic survey of 1986, catalogued as Bruff 26108 and referenced as AP 4/3665. At that moment, the circular cropmark or soilmark was legible enough from altitude to be recorded and classified. It sits in undulating pasture within a large rectangular field, approximately 145 metres north of the townland boundary with Ballyphilip, and it is not alone. Twelve ring-barrows have been recorded across three adjacent fields in the immediate area, forming a cluster or cemetery with an overall spread of around 200 metres in diameter. A further ring-barrow lies just 15 metres to the south-east. And 300 metres further south-east, across the boundary in the Ballyphilip townland within Clanwilliam Barony, a second cemetery of twelve ring-barrow sites has been recorded separately. This landscape, in other words, was once densely marked by the dead. The record for Coolnashamroge was compiled by Edmond O'Donovan and uploaded in September 2020.

A Google Earth image from June 2018 shows the field under cultivated grass, consistent with reclamation carried out in the late twentieth or early twenty-first century, which almost certainly explains why the monument is no longer legible at ground level or from above. Visitors to this part of County Limerick will find nothing to see on the surface; the value here lies in knowing what the ground contains rather than what it reveals. For anyone with a serious interest in prehistoric funerary landscapes, the broader cluster of sites across Coolnashamroge and Ballyphilip, spanning more than two dozen recorded monuments within a few hundred metres, suggests a concentration of prehistoric activity that the ordinary appearance of the fields gives no indication of whatsoever.