The earthwork recorded in the townland of Glenogra, County Limerick, belongs firmly to the second category. It is a mound of roughly ten metres in external diameter, sitting on gently sloping pasture in the south of the county, and it has the peculiar distinction of being visible from the air in one set of photographs taken in 1986, and essentially invisible in every satellite image taken since. It does not appear on any historic Ordnance Survey Ireland maps. It is, in the formal language of archaeological survey, a site that exists largely on paper.

The mound was identified during the Bruff aerial photographic survey of 1986, catalogued as Bruff 62 (AP 4/3646). At the time, the survey captured what appeared to be a low earthwork abutting a farm lane and field boundary running roughly north-west to south-east along its north-eastern side. A barrow, in the Irish archaeological sense, is typically a burial mound of prehistoric date, ranging from modest earthen rises to more elaborate ring-ditched structures, and this one, modest in scale, fits the lower end of that spectrum. It sits approximately 230 metres north of the townland boundary with Coolfune and around 560 metres east of the Camoge River. Glenogra church and its associated graveyard lie roughly 320 metres to the north-north-west, a reminder that this corner of Limerick has been a place of some human significance across different periods. When researchers checked OSi orthoimages from 2005 to 2012, Digital Globe imagery from 2011 to 2013, and Google Earth images from 2006 and 2018, the mound had become undetectable. Whether it was masked by crop growth, disturbed by agricultural activity, or simply too subtle for modern imaging to resolve is not recorded. The survey record was compiled by Edmond O'Donovan and uploaded in October 2020.

Because the site is not visible from the ground in any reliably documented way, and is not marked on any public mapping, there is no straightforward approach for a casual visitor. The surrounding land is agricultural pasture, and access would require landowner permission. The value of the site, for now, lies less in what can be seen and more in what the 1986 aerial photograph preserves: a moment when a low swell in a Limerick field briefly caught the light at the right angle, long enough for someone to notice it and write it down.