This one, in the townland of Ballynagallagh in County Limerick, exists now only as a ghost in a photograph. The enclosure shows up in the landscape record as a rectilinear cropmark, open to the east, revealed briefly from the air before apparently disappearing from the ground altogether. Cropmarks form when buried or levelled features affect how vegetation grows above them, creating faint outlines visible in dry summers or from altitude but invisible at eye level. That is the only form this particular monument has ever taken in the documentary record: a shape in a field, seen once, from above.

The enclosure was identified during the Bruff aerial photographic survey in 1986, recorded under reference Bruff 284 and preserved in McCloud colour negatives 16 and 17. It sits in improved wet pasture cut through by land drains and watercourses, roughly 225 metres south-west of the townland boundary with Loughgur and 775 metres south of Lough Gur, a lake long recognised as one of the most archaeologically significant areas in Ireland. A second enclosure, catalogued separately as LI032-188, lies 125 metres to the east. Neither feature appears on Ordnance Survey Ireland historic maps, and when researchers checked more recent satellite and ortho-imagery, including images taken between 2005 and 2012, between 2011 and 2013, and again in June 2018, the monument was no longer detectable. The record was compiled by Alison McQueen and Vera Rahilly and uploaded in November 2020.

There is, practically speaking, nothing to see here in the conventional sense. The site sits on private agricultural land, and the features that once suggested a structure have been levelled, most likely by generations of drainage work and pasture improvement. What makes it worth knowing about is precisely that absence. The broader Lough Gur area rewards exploration through its many accessible and well-documented sites nearby, and understanding that the visible monuments represent only a fraction of what the landscape once contained adds a different kind of depth to a visit. The wet, drained fields of Ballynagallagh hold something that only one set of photographs, taken on one particular day in 1986, ever managed to catch.