It does not appear on any historic Ordnance Survey Ireland maps, and there is nothing on the surface to suggest that the ground beneath the improved pasture holds anything of archaeological interest at all. The site only came to light when an aerial photographic survey, carried out over the Bruff area in 1986, caught the telltale signature of a circular cropmark below. A ring-barrow, for those unfamiliar with the type, is a burial monument consisting of a low mound enclosed by a surrounding ditch or bank, common across Ireland and Britain from the Bronze Age onward. They are rarely dramatic in person, but their presence in the landscape carries considerable weight.

The 1986 Bruff aerial survey, recorded as Bruff 103.02 and AP 4/3620, was the first to identify this feature as a ring-barrow. It is one of three such monuments in the immediate area, catalogued together as LI033-112001 through 003, and the three are aligned along a northwest to southeast axis, a spatial arrangement that hints at deliberate planning rather than coincidence. The site sits roughly 30 metres south of a watercourse and 170 metres north of the field boundary marking the townland division with Arrybreaga. Cropmarks of this kind appear when buried features affect the growth rate of surface vegetation; in dry summers especially, the circular outline of a buried ditch can show up clearly from the air even when the ground surface gives nothing away. The monument remained visible as a circular cropmark on Ordnance Survey orthophotos taken between 2005 and 2012, and again on a Google Earth image dated 18 November 2018.

Because this is privately held agricultural land, access is not something a visitor can simply assume. The barrow itself is invisible at ground level, so anyone making their way to the general area of Garryheakin would be looking at ordinary pasture without the benefit of an aerial vantage point. The cropmark is best appreciated through the publicly available Google Earth imagery, where the circular form is clear enough. For those with an interest in the wider archaeological landscape of this part of County Limerick, the grouping of three aligned barrows in this townland is the detail worth sitting with; the question of who placed them there, and why in that particular sequence, remains open.