The mound is horseshoe-shaped, open to the west, and is what archaeologists call a fulacht fia, a type of prehistoric cooking site found in their thousands across Ireland. The standard interpretation is that such sites were used for boiling water, likely by heating stones in a fire and dropping them into a water-filled trough, a method that generates exactly the kind of shattered, heat-damaged stone that accumulates into these characteristic spreads. Around 1986, this particular mound was levelled, flattening what would have been a more pronounced earthwork.

What makes the Knockanroe site quietly notable is not the mound itself but its immediate neighbour. A second fulacht fia lies roughly twenty-five metres to the north-west, the two sites sitting close enough together to suggest either repeated use of a favoured location over time, or perhaps broadly contemporary activity at a spot that offered some practical advantage, perhaps reliable water, a sheltered aspect, or proximity to routeways that no longer register in the landscape. Paired or clustered fulachtaí fia are known elsewhere in Cork and across Ireland, though the reasons for their grouping are not fully understood. The Bronze Age date most commonly assigned to these sites places them within a broad span of prehistoric activity, and the sheer density of fulachtaí fia across Munster suggests they were a routine rather than exceptional feature of the ancient countryside.