This ditch-barrow at Ballynagally sits in wet pasture, conjoined with a neighbouring barrow to the south-west, part of a loose cluster of similar monuments in the area. A ditch-barrow is a low earthen mound, typically of prehistoric date, encircled by a surrounding ditch rather than an external bank, which is what distinguishes it from other barrow types. What makes this one especially curious is how thoroughly it evaded the record for so long.

The monument does not appear on any historic Ordnance Survey Ireland maps, nor was it picked up by aerial orthoimages taken between 2005 and 2012, or by Digital Globe surveys between 2011 and 2013. Its first recorded identification came from the Bruff aerial photographic survey in 1986, where it was catalogued as a circular enclosure with an external diameter of approximately 28.5 metres north to south and 27.5 metres east to west, appearing in the survey record as Bruff 218. A further aerial survey by the Archaeological Survey Ireland in January 2003 confirmed its presence when viewed from the south-west. Even then, visibility has proven inconsistent: Google Earth imagery from March 2017 shows the enclosure reasonably clearly, while imagery taken just over a year and a half later, in November 2018, renders it indistinct. Soil moisture, seasonal growth, and the particular angle of light all conspire to make this the kind of site that reveals itself only under the right conditions. The record was compiled by Edmond O'Donovan and uploaded in September 2020.

Ballynagally is a rural townland in the Bruff area of south County Limerick, and the monument sits in actively farmed wet pasture, so access requires both local knowledge and landowner permission. There is no formal public access, and the ground conditions mean that heavy footwear is advisable in most seasons. The site is best appreciated not by standing in the field itself, where the slight topography of a ditch-barrow can be hard to read at ground level, but by cross-referencing the aerial survey images that accompany the National Monuments Service record. A nearby enclosure is recorded roughly 50 metres to the west-south-west, suggesting this corner of Limerick was once a more densely occupied landscape than its present quiet pasture would suggest.