This one in Caherelly East, County Limerick, does the opposite. It exists, for the most part, as an absence, a circular shadow that appears and disappears depending on the season, the crop, the angle of light, and the particular satellite passing overhead on a given day. What archaeology knows of it comes largely from the air rather than the ground.

The monument was first identified not by excavation or ground survey but through aerial photography, when the Bruff aerial photographic survey of 1986 captured what appeared to be a circular cropmark, recorded as Bruff 139 (AP 4/3658). Cropmarks of this kind form when buried features, such as the filled-in ditches or compacted soils of a former enclosure, cause the vegetation above them to grow differently from the surrounding land, creating outlines that are invisible at ground level but legible from altitude. The enclosure appears to measure approximately 30 metres in diameter. Notably, it does not appear on any Ordnance Survey historic maps, which suggests it had already been largely absorbed into the agricultural landscape before systematic mapping began. A faint outline was still visible on an OSi orthoimage taken between 2005 and 2012, but by the time Digital Globe photographed the area between 2011 and 2013, and again when Google Earth captured it on 28 June 2018, the monument had effectively vanished from view. It sits in improved wet pasture, roughly 90 metres west of a watercourse and 135 metres east of the townland boundary with Caherelly West. A ring-barrow, a low circular earthwork typically associated with prehistoric burial, lies approximately 185 metres to the southeast, hinting that this corner of Limerick held significance across a long span of time.

There is little to see here in any conventional sense. The site sits in working farmland and shows no surface trace that a casual visitor could confidently identify. The interest is really in the idea of it: a monument known almost entirely through one photograph taken nearly four decades ago, briefly glimpsed again from space, and now silent. Those who find value in such places, where the archaeology is more conceptual than visible, might cross-reference the 1986 aerial image with the current OS mapping to locate the approximate position, though access to the surrounding pasture would require landowner permission. The best chance of a cropmark reappearing, should conditions ever allow it, would be during a dry summer when grasses over buried features are first to show stress.