There is no stream nearby, but the ground to the north-west is waterlogged, which is precisely the kind of detail that would have made this spot attractive thousands of years ago. Beneath the thick sod cover lies a core of friable, angular granite fragments, and traces of revetment, a lining of stone used to hold the edges of a pit or trough in place, survive along the northern side of the trough area.

This is a fulacht fia, a type of prehistoric cooking site found in great numbers across Ireland, typically dating to the Bronze Age. The standard interpretation is that stones were heated in a fire and then dropped into a water-filled trough to bring it to boiling point, with the cracked and fire-shattered stones discarded into a surrounding mound over repeated use. The horseshoe or kidney shape of the mound, open on one side where the trough sat, is one of the most recognisable signatures of the site type. What makes Doughiska quietly interesting is the cluster of similar features surrounding it. Four other small, low mounds are visible in the immediate vicinity, at distances ranging from five to forty-seven metres, and these are considered likely to be fulachta fiadh as well. Whether they represent repeated activity over a long period, or the work of a community using the same waterlogged ground in parallel, is the kind of question that only excavation could answer.