Known as a burnt mound, or fulacht fiadh in Irish, it is the kind of monument that is easy to walk past without realising what it represents: the accumulated debris of repeated prehistoric cooking or industrial activity, where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil. The process left behind exactly what survives here, a heap of thermally shattered rock, spent and discarded after each use. The mound at Glanareagh measures roughly seven metres north to south, four metres east to west, and only about sixty centimetres high, its low profile now further obscured by encroaching bushes and trees.

What gives the site an additional layer of interest is its relationship to the landscape around it. Burnt mounds are almost always found close to water, and this one sits on the eastern bank of a stream, with the eroded bank itself exposing the burnt material in cross-section. That kind of natural exposure is archaeologically useful, offering an accidental window into the stratigraphy that would otherwise require excavation to see. More striking still is that a second burnt mound lies approximately twelve metres to the south, the two sites forming a close cluster that suggests either repeated use of this particular stretch of stream over time, or perhaps concurrent activity during the same period. Such pairings are not unheard of among fulacht fiadh sites, which are among the most numerous prehistoric monument types in Ireland, but finding two in such proximity, both still legible in the landscape, is quietly remarkable.