It measures just over fourteen metres across and rises only thirty centimetres above the surrounding ground, barely noticeable to anyone who did not know what to look for. At its centre is a hollow, roughly four and a half metres wide and sinking nearly a metre into the earth, which is the characteristic signature of a fulacht fia.

A fulacht fia is a Bronze Age cooking site, most commonly dated to between 1500 and 500 BC, though some examples are older. The typical arrangement involved a trough dug into the ground and lined to hold water, a nearby source of water to fill it, and a large supply of stones that could be heated in a fire and dropped into the trough to bring the water to a boil. The discarded, fire-cracked stones accumulated over repeated use into the horseshoe-shaped or circular mound that survives today. The central depression at this site corresponds to where the trough once sat. What makes the Kilberrihert example particularly notable is that it does not stand alone; it is one of a cluster of three fulachta fiadh in the immediate area, suggesting this stretch of streamside ground was a place of repeated, possibly communal, activity rather than a single-use site. The proximity of the stream would have made the location practical for exactly the purpose these monuments served, providing a reliable water source close at hand.