It is a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, typically dating from the Bronze Age. The mound itself is the accumulated debris of repeated use: shattered, fire-cracked stone, blackened and discarded after being heated and plunged into water-filled troughs to bring them to the boil. Over centuries of use, these broken stones pile up into the horseshoe or oval mounds that survive in the landscape today. This one measures roughly thirteen metres north to south and eight metres east to west, rising to about sixty-five centimetres at its highest point, modest dimensions but consistent with the type.

What makes the Barrahaurin site quietly interesting is its immediate context. It lies to the south-east of a stream, which is typical; fulachtaí fia are almost always found close to a reliable water source, since water was central to how they functioned. More striking is the proximity of a second fulacht fia, sitting only around fifty metres to the north-east. The clustering of these sites is not unheard of, and may suggest repeated or prolonged activity in a particular area over time, though the relationship between the two monuments is not fully understood. Along the north-eastern edge of the mound, an arc of four stones survives, possibly the remnants of a revetment, a low stone edging used to stabilise the sides of a working trough or the mound itself. A field fence now runs across the mound from north-west to south-east, a reminder of how routinely such ancient features have been absorbed into the working landscape without anyone necessarily registering what lies beneath the grass.