Yet that is exactly what the antiquarian T. J. Westropp proposed in 1920, when he sketched the earthworks around Monasteranenagh and noted this particular feature as a 'ring mound' forming part of the territory of the Óenach Cairbre. An óenach was a periodic assembly held in early medieval Ireland, combining legal, commercial, and ritual functions, something like a fair, a court, and a festival compressed into one gathering. What makes this corner of County Limerick unusual is not any single monument but the density of related features clustered within a short distance of one another, suggesting the whole area functioned as a coherent ceremonial complex over a very long period.

Westropp drew comparisons between the Óenach Cairbre territory and some of the most significant prehistoric and early historic landscapes in Ireland, including Rathcroghan in County Roscommon, Brugh na Bóinne in County Meath, and nearby Knockainey Hill in County Limerick. Such complexes, he observed, typically combine an assembly place, a sanctuary, a cemetery expressed through tumuli and ring mounds, ancient roads, and a water source. Here, nearly all of those elements are present. A pair of conjoined ringforts understood to be the assembly place itself lies roughly 560 metres to the west. An ancient roadway, as Westropp described it, runs from a fording point on the Camoge to those enclosures; the ford was recorded under the name 'The Ford of the Chariots of Fergus'. Writing in 1930, Power described the earthworks near the Óenach Cairbre as monuments of considerable size crowning a gentle elevation opposite the abbey, possibly connected with the great fair and its associated pagan rites. The ringfort described here, recorded as an oval earthwork measuring roughly 27 metres by 23 metres on the 1897 Ordnance Survey 25-inch map, sits on a south-facing slope with the Camoge defining its western edge and a stream close to the southeast.

When the Archaeological Survey of Ireland examined the site in 2007, the monument had been significantly reduced. The bank, once enclosing the oval interior, survived mainly as a levelled earthwork some 6.3 metres wide, with an internal height of around 0.4 metres and an external height of 1.3 metres; at the northwest and southeast it had been further reduced to a simple scarp. A slight external fosse, a shallow ditch running around the outside of the bank, remained traceable from the north around to the southeast, where nettles now mark its course. A channel roughly 4 metres wide, open to the river, cuts through the fosse on the western side. The interior is level. The site sits on private farmland in improved pasture, and the aerial images from various surveys between 2005 and 2018 show it as a partially tree-covered oval earthwork. A second ringfort lies just 45 metres to the north-northwest, underlining how closely these features are grouped across this quiet stretch of the river valley.