This one, sitting on low-lying wet pasture in the townland of Doonvullen Upper, County Limerick, does almost the opposite. It appears on no Ordnance Survey historic maps, it was invisible on Digital Globe orthophotos taken between 2011 and 2013, and a Google Earth image captured on 28 June 2018 shows nothing there at all. The enclosure exists, in the documentary record at least, because of a single aerial survey carried out decades ago, and the land itself has since quietly swallowed whatever mark it once made on the surface.

The site came to light through the Bruff aerial photographic survey of 1986, recorded as Bruff 263 (AP 4/3689), which identified the cropmark or soil-mark pattern consistent with an enclosure. Enclosures of this kind, broadly circular or oval boundaries defined by a ditch, bank, or both, are among the most common archaeological monument types in Ireland, associated variously with early medieval settlement, stock management, or ritual use, though without excavation it is rarely possible to say which. What the aerial survey captured was a fleeting visibility, the kind that depends on particular combinations of crop growth, soil moisture, and light angle that may not repeat for years or generations. A related enclosure, catalogued separately as LI023-184002-, lies approximately 50 metres to the north-west. The record was compiled by Edmond O'Donovan and uploaded to the national database on 2 September 2020.

The site sits roughly 15 metres west of the townland boundary with Ballyhobin, on improved pasture that has clearly been worked and drained over many years, which may itself explain why surface traces have been so thoroughly reduced. For anyone attempting to visit, there is little to see on the ground, and the surrounding fields are private farmland. The real interest here is less about what you might observe in person and more about what the record reveals: that the Irish landscape continues to hold features that only become legible under specific conditions, visible for a moment from the air in a particular year, then gone again into the grass.