This one in the townland of Lacka, in the barony of Pubblebrien in County Limerick, does none of that. It exists, as far as anyone on the ground can tell, as nothing at all: a patch of pasture on a steep east-facing ridge slope, divided into paddocks by timber fencing, with no earthwork, no visible feature, no surface trace whatsoever. Its presence is known only because, for a brief moment, a difference in the grass gave it away from the air.

The site was detected as an oval-shaped cropmark on aerial photographs taken for the Bórd Gáis Éireann Curraleigh West-Limerick gas pipeline survey, referenced as BGE 1/5000, 2457. Cropmarks, for those unfamiliar with the term, appear when buried archaeological features, such as ditches or walls, affect how overlying vegetation grows, making buried outlines briefly legible from above in dry conditions. The oval shape that emerged from those photographs is consistent with an enclosure, the broad category of circular or oval ditched or banked spaces used throughout Irish prehistory and the early medieval period for settlement, farming, or ritual purposes. The Archaeological Survey of Ireland examined the site in 2007 and recorded that no surface remains were visible. It does not appear on Ordnance Survey Ireland historic maps, nor on aerial orthoimages taken between 2005 and 2018 by OSi, Digital Globe, or Google Earth. A related enclosure, recorded separately, lies roughly 35 metres to the south-east, and the field's western edge sits just 25 metres from a watercourse that doubles as the townland boundary with Rathmore North. The site was compiled by Alison McQueen and Vera Rahilly, and uploaded to the national record in October 2020.

There is nothing to see at Lacka in any conventional sense. The enclosure is unscheduled in public consciousness, absent from walking guides, and invisible underfoot. A visitor passing through would see only the ridge, the fencing, the watercourse at the field margin, and the eastward drop of the slope. What makes it worth knowing about is precisely that absence; it is a reminder that Ireland's archaeological map is substantially made up of sites like this one, known only through a lucky angle of light on dry summer grass, and recorded before that knowledge, too, disappears.