The enclosure at Killuragh exists, for most practical purposes, as a ghost in the landscape, revealed not by stone or earthwork but by the differential growth of crops above it.

The monument was identified during the Bruff aerial photographic survey in 1986, recorded as reference Bruff 145: AP 4/3729. What the survey captured was a penannular cropmark, meaning a ring that is almost, but not quite, closed, interrupted at one point in its circuit. Cropmarks of this kind appear when buried features, whether the ditches or walls of an old enclosure, affect how the vegetation above them grows. In dry summers, crops over a filled ditch tend to stay greener longer, drawing on the deeper moisture below, while crops over buried stone may yellow and thin. From the ground, there is nothing to see. From a low-flying aircraft at the right moment, the shape beneath declares itself. The record notes that the monument sits roughly 25 metres north of the Mulkear River, placed in land that has since been brought into agricultural use, which is likely what obscured it further. By the time Digital Globe orthophotos were taken between 2011 and 2013, and again when Google Earth imagery was captured in June 2018, the enclosure was no longer legible from above either.

For anyone curious enough to visit the general area, the Mulkear River flows through a quiet stretch of mid-Limerick countryside, and the townland of Killuragh sits within a part of the county that rewards slow travel. There is nothing to see at the specific site; the point of the place is precisely that absence. What the 1986 survey photograph preserves is a moment when weather, crop, and altitude briefly conspired to make something ancient legible. The record was compiled by Alison McQueen and Vera Rahilly and uploaded in July 2020, part of a broader effort to document monuments that exist more reliably in archives than they do in the field.