This one in Ballynagreanagh, County Limerick, is notable for what it no longer shows. A fulacht fia, to give the briefest explanation, is a type of prehistoric cooking or hot-water site, typically consisting of a trough and a mound of burnt, heat-shattered stone accumulated through repeated use over centuries. They are among the most common ancient monument types in Ireland, and yet even common things can quietly disappear.

At some point between the first detailed Ordnance Survey mapping of the nineteenth century and the present day, this one effectively vanished from view. It does not appear on the 1840 edition of the OSi six-inch map, which suggests it was already inconspicuous or unrecognised at that early stage of systematic surveying. By contrast, the later OSi twenty-five-inch map does record it, depicting a horseshoe-shaped area measuring roughly 18 metres northeast to southwest and 15 metres northwest to southeast, enclosed by a low bank running from east around through south and west to north, and open at the northeast. That horseshoe form is entirely typical of the monument type. When the Archaeological Survey of Ireland visited in 2007, however, they recorded no surface remains visible. Subsequent orthophotography from the OSi, covering the period 2005 to 2012, shows nothing, and Google Earth imagery from both November 2018 and September 2020 is equally blank. The site sits in reclaimed pasture just north of a field boundary running northwest to southeast, and approximately 110 metres southwest of the townland boundary with Knockderk.

There is, practically speaking, nothing to see here now. The ground has been smoothed by agricultural improvement, and whatever slight earthwork once marked the spot has been absorbed into ordinary farmland. What makes it worth noting is precisely that arc of documentation: recorded, then lost to the eye, then surveyed and found absent, then confirmed absent again across multiple subsequent images. For anyone interested in monument survival and landscape change rather than in visible ruins, the Ballynagreanagh fulacht fia is an instructive case. The reclaimed pasture gives no hint of what the maps once showed, and without the paper record the site would simply not exist in any practical sense at all.