This one barely announces itself at all. A ring-barrow, a low circular mound typically raised over a prehistoric burial and surrounded by a ditch, sits on a north-facing slope in the townland of Cross, in County Limerick's Coonagh barony, visible not to the naked eye on the ground but only as a faint circular cropmark when seen from the air. That distinction between what the earth hides and what aerial photography briefly reveals is the whole point here.

The monument was identified during the Bruff aerial photographic survey in 1986, recorded under the reference Bruff 106 (5), when a small circular cropmark consistent with a ring-barrow showed up in the survey imagery. Cropmarks of this kind appear when buried features affect how overlying vegetation grows, particularly during dry spells, producing patterns legible from altitude that are otherwise imperceptible at ground level. Compiled by Fiona Rooney and uploaded to the record in July 2020, the site sits 92 metres southeast of the Reask River, which forms the townland boundary with Brackyle, and 123 metres east of the boundary with Knockballyfookeen. It is not isolated: a possible enclosure lies roughly 70 metres to the northeast, and around 247 metres to the southeast there is a cluster of further features including three barrows, another enclosure, and an earthwork. The site itself forms part of a group of five ring-barrows in the immediate area. By the time Ordnance Survey Ireland orthophotos were taken between 2005 and 2012, only a faint trace of the monument remained detectable, and by the Google Earth image of November 2018 it had effectively disappeared from view entirely.

The site sits in pasture, which means access would require landowner permission, and there is in any case very little to see at ground level. What makes a visit worthwhile, if one is passing through this part of County Limerick, is the wider landscape context. The clustering of barrows, enclosures, and earthworks across this stretch of ground suggests a concentration of prehistoric activity that the unremarkable modern field surface does almost nothing to betray. Bringing a copy of the 1986 survey cropmark image gives you something to hold against the view, a way of reading a field that would otherwise offer nothing back.