No mark on any historical map, no standing stone, no visible mound. What exists instead is a shallow circular depression, roughly seven metres across, defined by a fosse, the term used for a ditch cut into the ground, that has been slowly erased by centuries of agricultural activity. This is a ditch-barrow, a type of prehistoric funerary enclosure in which the defining feature is the surrounding ditch rather than an earthen mound above ground. Its presence was entirely unknown to official cartography until someone looked down from the air.

The site came to light during the Bruff aerial photographic survey of 1986, when a small circular form was identified in the cropmarks and soil parchmarks visible from above, catalogued as survey reference Bruff 83, aerial photograph AP 4/3678. Cropmarks form when buried features affect the growth of vegetation above them, and in dry summers or at certain angles of light they can reveal what ground-level inspection entirely misses. The monument sits approximately 22 metres west of a stream and 153 metres north of the townland boundary with Garrison, placing it in a quietly concentrated ritual landscape. Ring-barrows, which are related circular enclosures typically consisting of a low bank and outer ditch, lie roughly 100 metres to the north and approximately 40 metres to the southwest, suggesting this corner of Kilduff was used repeatedly for burial or commemoration during prehistory. The outline of the ditch-barrow was still discernible in satellite imagery captured between 2011 and 2013 via Digital Globe, and again in a Google Earth image taken in November 2018, compiled into the record by Fiona Rooney in July 2020.

There is nothing to see at ground level in any conventional sense. The field is working pasture, and the monument exists primarily as an entry in the Sites and Monuments Record and as a faint ring in aerial and satellite photography. Anyone with an interest in the site would do well to examine the Bruff Survey aerial image and the Google Earth orthoimage referenced in the record before visiting, as these give a clearer sense of the monument's outline than the landscape itself is likely to provide. The value here is less in what the eye can find on the ground and more in what the exercise reveals about the density of prehistoric activity across what now appears to be entirely ordinary farmland.