This one, tucked inside a coniferous forestry plantation in Ballingayrour, County Limerick, has effectively disappeared. What makes it unusual is not what you can see, but what was once glimpsed from the air and has since been swallowed entirely by the landscape around it.

The site was identified during an aerial photographic survey of the Bruff area in 1986, catalogued under reference AP 5/2063 and labelled Bruff 149 in the resulting imagery. From altitude, the outline of what appeared to be an enclosure was just about legible in the ground, a faint crop or soil mark of the kind that aerial survey, one of archaeology's most productive tools for detecting buried or vanished features, is specifically designed to catch. An enclosure in this context would typically refer to a defined area bounded by a ditch, bank, or wall, often associated with settlement, ritual, or agricultural activity in the early medieval or prehistoric periods. It sits approximately 90 metres east of the townland boundary with Ballincurra, and a barrow, a burial mound of likely prehistoric origin, lies a further 200 metres to the east, which suggests this corner of Limerick may have seen more activity over the centuries than the current plantation of conifers implies. Crucially, the feature does not appear on any historic Ordnance Survey Ireland maps, meaning it was never recorded in the standard cartographic record and only came to light through that single aerial observation.

By the time orthophotography was carried out between 2005 and 2012, no surface trace of the possible enclosure remained visible, and a Google Earth image dated 20 September 2020 confirmed the same. The forestry plantation has done an effective job of obscuring whatever ground-level evidence might once have existed. There is, in practical terms, nothing to see on foot. The site's interest lies almost entirely in its ambiguity: a shape observed once from the air, unconfirmed by excavation, absent from the map record, and now invisible. It was compiled into the record by Martin Fitzpatrick and uploaded in May 2021, which means it exists, for now, as a question mark in a database rather than a point on any tourist route.