This one in Ballycahill, County Limerick, offers almost nothing to the naked eye. What appears to be a circular enclosure of roughly four metres in diameter survives only as a cropmark, the kind of ghost that shows up in aerial photography when differential soil moisture causes crops to grow at slightly different rates above buried features. It does not appear on any Ordnance Survey Ireland historic maps, and standing in the reclaimed pasture where it lies, there is simply nothing to see.

The site was identified in 1986 by Katherine Daly, working from the Bruff aerial photographic survey, specifically from photograph 263 in that series. From that imagery she interpreted the feature as a possible enclosure, though its function and date remain unclear. The record was compiled by Fiona Rooney and uploaded to the national monuments database in July 2021. A Digital Globe orthoimage taken sometime between 2011 and 2013 confirmed the faint circular cropmark was still discernible from above, placing the feature approximately 105 metres east of the townland boundary with Elton, with the earthwork itself sitting around 95 metres to the northeast of that reference point. More recent Google Earth orthoimages show no surface remains whatsoever.

This is not a site that rewards an unannounced visit. There are no interpretive signs, no visible earthworks, and the land is reclaimed agricultural pasture with no public-facing infrastructure around the monument. Its interest lies almost entirely in what it represents methodologically, namely how aerial survey continues to surface features that generations of map-makers and ground surveyors simply never recorded. Anyone with a serious interest in the Bruff aerial photographic series can trace the original identification through the national monuments record under reference LI040-185----, where the annotated photograph and accompanying orthoimages are listed as supporting documentation.