At Knockilly in north County Cork, an oval-shaped mound sits on the northern bank of a stream, recorded but unverified, known to archaeology mainly by its outline on a map.

A fulacht fia is a type of ancient outdoor cooking monument found in great numbers across Ireland, typically consisting of a horseshoe or oval mound of heat-shattered stone beside a water source. The prevailing theory holds that stones were heated in a fire and then dropped into a trough of water to bring it to a boil, the cracked and discarded stones accumulating over time into the characteristic mound. They date most commonly to the Bronze Age, though some were used into the early medieval period. The Knockilly example was noted on the Ordnance Survey six-inch map of 1937, which recorded it as a roughly oval mound beside a stream, the kind of topographic detail that can sit quietly in a map archive for decades before anyone thinks to follow it up. When an attempt was made to inspect the site in person, permission was refused by the landowner, leaving the mound unexamined and its condition unknown.