That, in its own quiet way, is precisely the point. A small enclosure once stood here, marked on the first edition of the Ordnance Survey map, but nothing of it survives above ground today. The site belongs to a category of place that archaeology occasionally has to reckon with honestly: known, recorded, and gone.

The first edition OS maps, surveyed across Ireland largely in the 1830s, captured countless earthworks, field boundaries, and enclosures that have since been ploughed out, built over, or simply eroded away. Enclosures of this kind were common features of the early Irish landscape, typically circular or oval ringforts used as farmsteads, sometimes dating back to the early medieval period. Whatever this particular example at Shannera once was, its position on the summit of a low rise west of the Finglas river would have been characteristic, slightly elevated ground offering drainage and visibility. A. O'Sullivan and J. Sheehan documented it in their 1996 archaeological survey of the Iveragh Peninsula, noting even then that no visible trace remained.