It is a fulacht fia, a type of ancient cooking or processing site found in great numbers across Ireland, typically Bronze Age in origin. The mound itself, roughly circular in shape, measures about twelve metres across and rises to just under a metre in height. That modest elevation is composed almost entirely of burnt and fire-cracked stone, the accumulated debris of repeated cycles of heating and discarding, built up over time into a distinctive horseshoe or oval shape. Thousands of these features survive across the Irish countryside, but what makes Knockane particularly striking is not this single example but what surrounds it.

Within a radius of roughly 130 metres, five further fulachta fiadh have been recorded in the same area, spread out to the south-east, east-north-east, and east of the first mound. The clustering is unusual. Whether this reflects repeated seasonal use of a favoured location over generations, or broadly contemporary activity by a community working close together, is the kind of question that only excavation could begin to answer. Fulachta fiadh are generally interpreted as sites where water was heated by dropping fire-heated stones into a trough, then used for cooking, textile processing, bathing, or some combination of these purposes. The burnt stone, useless after a single heating, was raked aside and the trough refilled, producing the characteristic mound of shattered material that survives long after the organic elements of the site have vanished entirely.