This one in Raheen, in the barony of Coshlea in County Limerick, does almost the opposite. It exists, as far as anyone can tell, as a faint circular shadow visible only from the air, and only under particular conditions. There is nothing to see at ground level, and yet the evidence strongly suggests a barrow, a prehistoric burial or funerary mound, lies somewhere beneath the pasture.

The site came to light not through excavation or survey walking but through aerial photography taken on 3 November 1984 as part of work on the Bórd Gáis Éireann Curraleigh West to Limerick gas pipeline. On those photographs, catalogued as BGE 1/5000, frame 2580, Site 237, a circular cropmark is visible in the field. Cropmarks appear when buried features affect how vegetation grows above them, with differences in soil moisture and composition causing crops or grass to grow at slightly different rates, producing shapes readable from altitude even when the ground itself looks uniform. The feature was identified as a potential barrow and recorded within the northeast quadrant of a wider cluster of monuments in the area. It does not appear on the Ordnance Survey Ireland six-inch maps, suggesting it was already invisible at ground level by the time those maps were made. Digital Globe imagery taken between 2011 and 2013 showed no surface trace at all, though a faint outline re-emerged on a Google Earth orthoimage captured on 18 November 2018, compiled as part of a record uploaded by Fiona Rooney in September 2021.

For anyone visiting the area, the pasture around Raheen holds no visible marker for this particular feature, and access to private farmland would require the landowner's permission. The broader monument cluster of which this forms a part may offer more to observe nearby, though this barrow itself rewards a different kind of attention, one directed at aerial images rather than the ground underfoot. The 2018 Google Earth image, cited in the record, is publicly accessible and gives a sense of just how tenuous the visible trace is, a faint arc in a green field, more suggestion than structure.