It measures just under six metres from north to south and rises less than a metre from the ground, but beneath the turf it is composed almost entirely of burnt and fire-cracked stone. This is a fulacht fia, a type of prehistoric cooking site found in considerable numbers across Ireland, typically Bronze Age in origin. 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, with the cracked and spent stones gradually accumulating into the horseshoe-shaped or oval mound that survives today. The site sits on the south bank of a stream, which is precisely where you would expect to find one; proximity to a reliable water source was the whole point.

What makes Drombohilly quietly unusual is not this mound alone but its company. Within roughly 50 metres to the south lies another fulacht fia, and approximately 120 metres to the north-north-west sits what may be a third, though its identification remains uncertain. Three such sites clustered within a couple of hundred metres of one another on the same hillside suggests this stretch of ground saw sustained or repeated use over time, rather than a single, isolated episode of activity. Whether they were contemporary with one another or represent different phases of prehistoric occupation is not known, but the grouping is notable on a landscape that today carries nothing more than rough grazing.