This one, a barrow on the former demesne lands of Cahir Guillamore House in County Limerick, is known only because a camera mounted in an aircraft happened to pass over at the right moment. In 1986, an aerial photographic survey based out of Bruff captured what appeared to be a small, semi-circular cropmark in a field once used as a deerpark. Cropmarks occur when buried features affect the growth of crops or grass above them, causing subtle variations in colour or height that are invisible at ground level but legible from the air. Without that survey, the barrow, a prehistoric burial monument typically consisting of an earthen or stone mound raised over the remains of the dead, might have remained entirely unrecorded.

The site sits within the north-western quadrant of a wider field system, placing it in layered company. A rectangular enclosure lies roughly 40 metres to the north-west, and a cashel, which is a stone-walled ringfort of early medieval date, stands about 90 metres to the south-east. Cahir Guillamore House itself is 380 metres to the north-east. The landscape here, in other words, carries traces of activity from multiple periods, though the barrow itself has left no impression on the cartographic record. Its presence was confirmed again, tentatively, in orthophotography taken between 2005 and 2012 by Ordnance Survey Ireland, and once more in a Google Earth image dated 20 September 2020, each time as a possible cropmark rather than a definitive surface feature.

The site is on private land within a former deerpark and there is no formal public access. The barrow has no visible surface expression, meaning there is nothing to see at ground level; what exists is a shadow in the soil, legible only under particular conditions of light, crop growth, and altitude. The aerial photographs that revealed it, including the original Bruff survey image catalogued as Bruff 1006, are the closest most people will get to understanding what is there. For anyone researching the archaeology of the Bruff area, the record compiled by Fiona Rooney and uploaded to the national monuments database in March 2021 is the place to start.