It measures roughly ten metres east to west and just over seven metres north to south, rising to about a metre and a quarter in height. Where the southern face has been eroded away, the interior is exposed: a mass of heat-shattered stones and charcoal-darkened soil, the accumulated debris of repeated high-temperature activity carried out here, probably during the Bronze Age.

This is a fulacht fia, a type of prehistoric cooking or processing site found in enormous numbers across Ireland, with Cork alone holding thousands of recorded examples. The typical interpretation is that water was heated in a trough by dropping fire-heated stones into it; the stones, cracked and spent after each use, were discarded to the sides, gradually building up the characteristic mound. The horseshoe shape is the diagnostic signature of the type, with the open end of the curve marking where the trough would originally have sat. Here, that opening, some four metres wide, faces north towards marshy ground, which would have provided a convenient and reliable water source. What makes this particular site quietly notable is not so much its own dimensions as its company: a second fulacht fia lies roughly sixty metres to the south-west, suggesting this was not a one-off episode of activity but a place people returned to, or a landscape where communal or repeated use of some kind had meaning over time.