In a field of improved pasture in the Limerick townland of Arrybreaga, a prehistoric burial monument lies entirely invisible at surface level, its circular form detectable only when viewed from the air, and only under the right conditions. The site has never appeared on any of the historic Ordnance Survey Ireland maps, meaning it passed unrecorded for as long as such records have existed, hiding in plain sight beneath grazed land.

The monument was first identified during an aerial photographic survey conducted in 1986, catalogued under the Bruff survey as image reference Bruff 107. What the survey captured was a ring-barrow, a type of prehistoric funerary monument typically consisting of a low circular mound or flat area enclosed by a bank and ditch, used for burial during the Bronze Age and sometimes later periods. The feature shows up as a circular cropmark roughly nine metres in diameter, a pattern formed when differential moisture or soil conditions cause the grass or crops above a buried feature to grow slightly differently from the surrounding vegetation. That same cropmark has since been confirmed in Ordnance Survey Ireland orthophotography taken between 2005 and 2012, and again in a Google Earth image dated 18 November 2018. The site sits just south of a field boundary that doubles as the townland boundary with Garryheakin, and it is not alone in the landscape: a barrow lies approximately 140 metres to the west, two further ring-barrows sit around 70 metres to the south, and an earthwork feature has been recorded about 120 metres to the south-east.

Because the monument has no visible surface expression, a visit to the general area is more about appreciating the archaeology of the wider landscape than locating any specific feature underfoot. The site lies in private farmland, so access would require the landowner's permission. Those interested in the aerial evidence can consult the Bruff survey image and the publicly available Google Earth orthoimagery, both of which show the cropmark clearly. The best time to spot such features from the air, or in satellite imagery, is typically during dry summers when soil moisture differences are most pronounced, which is also when low-growing crops and grazed pasture respond most visibly to what lies beneath them. The record was compiled by Martin Fitzpatrick and uploaded to the relevant heritage database in April 2021.