Walk the pasture roughly a hundred metres north of the summit, at an elevation of 586 feet above sea level, and the ground gives nothing away. No raised profile, no ring of stones, no depression in the turf. The site registers as present in the archaeological record and absent from the visible landscape simultaneously, which is a peculiar condition even by the standards of Irish prehistory.

The barrow, a type of earthen funerary mound built during the Bronze Age or earlier, was not identified from the ground at all. It came to light through an aerial photographic survey centred on Bruff in 1986, when the outline of a circular cropmark became legible from above. Cropmarks appear when buried features affect soil drainage and moisture, causing the vegetation above them to grow differently, subtly enough that only height and the right season make the pattern readable. The site carries the record number LI033-050002 and sits within a wider funerary landscape: a ring-barrow lies 65 metres to the north-east, another 50 metres to the west, and a bowl-barrow, which typically presents as a rounded mound within a surrounding ditch, lies 100 metres to the south-east. None of this cluster appears on historic Ordnance Survey Ireland maps, suggesting the surface traces had already been lost to agriculture long before systematic mapping. Subsequent aerial photography by the Archaeological Survey of Ireland, including flights in August 2000 and October 2002, confirmed the site, though orthophotos taken between 2005 and 2012, along with a Google Earth image from September 2020, show no surface remains whatsoever. The record was compiled by Martin Fitzpatrick and uploaded in March 2021.

For anyone making their way to Cromwell Hill, the immediate area is agricultural land under pasture, and there is no formal access or waymarking for this site. The barrow itself offers nothing to the naked eye on the ground. What is worth understanding before visiting is that the interest here is documentary rather than visual: the landscape around the summit holds a concentration of prehistoric funerary monuments that only become apparent through the aerial record and through knowing where to look on a map. The broader hillside rewards careful attention to slight undulations in the terrain, particularly in the vicinity of the catalogued ring-barrows and bowl-barrow nearby, where surface traces may be marginally more legible depending on the season and the angle of light.