This one, on pasture land in County Limerick, does almost the opposite. There is nothing to see at ground level, and there may never have been very much to see at all. What exists here is essentially a question mark pressed into a field, a feature that was tentatively identified from the air and has since resisted any firmer classification.

The site sits on the demesne lands of Derk House, roughly 420 metres to the south-east of that property. A ring-barrow, for those unfamiliar with the term, is a burial monument of prehistoric origin, typically consisting of a low central mound surrounded by a circular ditch or bank, sometimes both. They are relatively common in the Irish landscape, though often subtle. This particular example was identified during the Bruff aerial photographic survey of 1986, recorded as Bruff 80 (AP 4/3626), when the distinctive circular cropmark pattern typical of such monuments appeared visible from above. Cropmarks form when buried features affect soil moisture and drainage, causing the vegetation above them to grow differently, and they can reveal outlines that leave no impression whatsoever at ground level. A second possible barrow has been noted roughly 200 metres to the south-west, which might suggest the area held some funerary significance. However, the site does not appear on any historic Ordnance Survey Ireland maps, and later aerial imagery, including an OSi orthophoto taken between 2005 and 2012 and a Google Earth image from September 2020, shows no visible surface remains. The record, compiled by Martin Fitzpatrick and uploaded in April 2021, notes the antiquity of the site as doubtful.

For anyone inclined to visit the general area, the land is private pasture and there is nothing physically present to locate or examine. The interest here is less about what you would find on the ground and more about what the episode illustrates: that aerial survey has periodically reshaped the map of Irish archaeology, revealing potential monuments invisible to walkers, only for later scrutiny to leave their status unresolved. The nearby landscape around Bruff in south County Limerick does contain confirmed prehistoric and early medieval sites, and the region repays exploration for those with an interest in how tentatively the archaeological record is sometimes assembled.