It is a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, and this particular example at Lisrobin is a reasonable specimen of the form: roughly eighteen and a half metres east to west, eight metres north to south, and still standing to a height of about 1.3 metres. What gives it a small extra note of interest is the spread of burnt material that trails southward from the mound all the way to the northern bank of the stream, suggesting that the relationship between the site and its water source was not merely incidental.

Fulachtaí fia, the plural form, are among the most common field monuments in Ireland, with thousands recorded across the country. The basic working principle, as understood from excavated examples elsewhere, involved heating stones in a fire until they were intensely hot, then dropping them into a water-filled trough to bring it to the boil. The shattered, heat-spent stones were discarded to the side, and over repeated use they accumulated into the horseshoe-shaped or oval mounds that are so recognisable today. They date broadly to the Bronze Age, though some sites show evidence of use across long periods. The proximity to running water was essential, both for filling the trough and, it has been suggested, for drainage. At Lisrobin, the scatter of burnt material reaching down to the stream bank fits that pattern neatly, hinting at the repeated, practical activity that once made this otherwise unremarkable corner of a Cork field a working site.