This one does not. A mound sitting in flat pasture in the townland of Knockballyfookeen, County Limerick, has managed to escape every conventional means of detection. It does not appear on Ordnance Survey Ireland's historic maps. It does not show up on modern satellite orthoimages, including a Google Earth capture taken in November 2018. The only record of its existence as a monument comes from a single aerial photograph, and without that image, there would be no official trace of it at all.

The mound was identified through the Bruff aerial photographic survey, catalogued as Bruff 162 (AP 4/3673), and compiled by Edmond O'Donovan, with the record uploaded in September 2020. It measures approximately 17 metres in diameter and lies on flat pasture roughly 230 metres east of the townland boundary with Ballyshoneen. Aerial photography of this kind has long been one of archaeology's more productive tools in Ireland, revealing cropmarks and soil anomalies that ground-level inspection, or even standard satellite imagery, simply cannot resolve. The fact that this mound is visible in one specialist aerial photograph but invisible in all other sources places it in a particular category of monument, present in the record but essentially absent from the land as most people encounter it. Roughly 200 metres to the west-northwest lies a ring-barrow, a low circular earthwork typically associated with burial in the prehistoric or early medieval period, recorded separately as LI024-237.

A visitor arriving at Knockballyfookeen with the intention of seeing this mound should adjust their expectations accordingly. There are no surface remains to observe, no earthwork rising above the grass, and no marker indicating where the feature lies. The interest here is less in what can be seen and more in what the record itself reveals, namely how much of Ireland's archaeological landscape exists in a state somewhere between presence and absence, known to specialists through technical survey work but effectively invisible to everyone else, including the land itself as rendered by contemporary mapping tools.