To a passing eye it looks like little more than an uneven patch of ground, but it is the remains of a fulacht fia, a type of prehistoric cooking site found in great numbers across Ireland and particularly dense in Munster. The typical arrangement involved a trough dug into the ground, a nearby water source, and a hearth where stones were heated until red-hot, then dropped into the water-filled trough to bring it to a boil. The broken, fire-cracked stones were thrown aside after use, building up over time into the characteristic mound that survives today.

What makes the Knockbarry site quietly interesting is its pairing. A second fulacht fia lies immediately to the east, the two monuments sitting close together in the same field. Whether they were in use simultaneously or represent activity at different periods is not recorded, but the proximity is notable. The well nearby adds to the sense that this small corner of the landscape was deliberately chosen and returned to, water being as essential to the process as fire. Fulachtaí fia are generally associated with the Bronze Age, roughly 1500 to 500 BC, though some sites have produced dates ranging earlier or later. Most are found in low-lying or marshy ground close to streams or springs, which fits the Knockbarry arrangement well.