Measuring roughly 10.8 metres east to west, it is what archaeologists call a fulacht fia, the remains of a type of ancient cooking or industrial site found in enormous numbers across Ireland. The typical form is a horseshoe-shaped mound of fire-cracked stones, the accumulated debris of repeated heating and discarding; water would have been brought to the boil by dropping stones heated in a fire into a trough, and the cracked, spent stones were thrown aside to form the mound over time.

Thousands of fulachtaí fia have been recorded across Ireland, most dating to the Bronze Age, roughly 2000 to 500 BC, though some are earlier or later. What makes the Cloghvoula example quietly interesting is not the site itself in isolation but its company. Approximately 60 metres to the east lies a second fulacht fia, a spatial pairing that raises questions about whether both were in use at the same time, whether they served the same community, or whether one simply fell out of use and another was established nearby. Such clustering is not unheard of, but it is not routine either, and the proximity gives even this nearly invisible mound a small degree of archaeological weight.