It appears on the 1923 Ordnance Survey six-inch map as a curved arc running from the north-east to the south-east, suggesting a roughly circular structure with a diameter of approximately twenty metres. Today, nothing of it is visible. A dwelling house and its garden now occupy the site entirely.

Enclosures of this kind, typically defined by an earthen bank or ditch forming a rough ring or arc, are among the most common monument types in the Irish countryside. Many are of early medieval date, functioning as enclosed farmsteads or livestock enclosures, though without excavation it is rarely possible to say more with certainty. What the Mountcollins example looked like on the ground, who built it, or how long it survived before it was lost, are questions the record does not answer. Denis Power compiled the site entry, uploaded in August 2011, noting simply that the monument is no longer apparent and that domestic development has taken its place.

There is little to see at this particular location now, which is precisely what makes it worth understanding. It represents a category of loss that is common across Ireland, where the rural landscape has absorbed, built over, or gradually levelled countless features that were still legible, if only as crop marks or earthwork traces, within living memory. The 1923 Ordnance Survey mapping caught this one before it disappeared entirely, preserving at least a two-dimensional outline. For anyone interested in the density of unrecorded or vanished archaeology in north County Limerick, the Mountcollins area, situated in the foothills of the Mullaghareirk Mountains, is worth exploring on the older map sheets, where arcs, rings, and irregular field boundaries often hint at what the modern landscape has quietly absorbed.