It is roughly D-shaped, about four metres across east to west, with a straight side eight metres long and just over a metre high facing the water. That flat eastern face is no accident of weathering. The stream is actively cutting into it, and where the bank has slipped away, the interior is visible: heat-shattered stones and soil blackened with charcoal. This is a fulacht fia, a type of prehistoric cooking site found in considerable numbers across Ireland, typically consisting of a mound of burnt and fire-cracked stone accumulated beside a water source. The standard interpretation is that stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil, the cracked and spent stones discarded into the characteristic horseshoe or crescent shape that most examples take. The D-shape here, with its straight side aligned to the stream, is a less common profile.

Fulachtaí fia are generally dated to the Bronze Age, though some examples have produced evidence of use across a much longer span. They are among the most common prehistoric monuments in Ireland, yet individual sites retain a quiet particularity. This one occupies rough hill grazing on the slopes of Coomacarrea, a mountain in the Iveragh Peninsula in south-west Kerry, and its position overlooking the Owroe River valley suggests it was placed deliberately within a landscape that would have supported both pastoral activity and movement through the uplands. The erosion currently exposing the mound's burnt fill also means the site is being slowly diminished, the evidence accumulating in the streambed rather than remaining in place.