The site itself is now largely levelled, visible mainly as a circular spread of burnt stone and ash roughly five metres across, the characteristic signature of a fulacht fia.

A fulacht fia is a type of Bronze Age cooking site found in great numbers across Ireland, typically consisting of a trough dug into wet ground, a nearby hearth, and a mound of fire-cracked stones. The method involved heating stones in a fire and dropping them into water in the trough to bring it to a boil, which shattered and blackened the stones over repeated use, leaving exactly the kind of burnt mound visible here. This particular example sits in what was formerly marshy land on the lower ground to the north-east of a gently sloping ridge, the kind of damp, water-retaining terrain that Bronze Age people seem to have consistently favoured for this activity. What makes the Glenmagoo location especially striking is the density of similar sites in the immediate vicinity. Another fulacht fia lies approximately 45 metres to the north, and three further examples cluster to the south-south-west, south-south-east, and south-east, the nearest of them only about 64 metres away. All five sites occupy a relatively tight area of this same low-lying ground, which raises questions that archaeology has not yet fully answered about whether such groupings represent repeated seasonal use, different functional purposes, or simply the practical logic of returning to ground that reliably held water.