This is a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, typically near water and typically identified by that distinctive crescent of dark, fire-cracked material surrounding a central trough. The mound here measures roughly ten metres east to west and rises to about a metre in height, with a five-metre opening facing north.

What makes this particular site more than a solitary curiosity is its company. It is one of a group of six fulachta fiadh clustered together in this part of mid Cork, with a second example sitting immediately to the east. That kind of clustering is not unusual for fulachta fiadh, which Bronze Age communities appear to have returned to repeatedly, sometimes across generations. The basic method involved heating stones in a fire, dropping them into a water-filled trough to bring the water to a boil, and using that heat for cooking, or possibly for other purposes including textile processing or bathing, though cooking remains the most widely accepted explanation. Over time, the spent and broken stones were piled to the sides, forming the mound that survives today. At Knockane, a drain running north to south has cut through the western side of the mound, a relatively modern intrusion that hints at how farmland management has quietly altered the edges of sites like this across the Irish countryside.