Barely forty centimetres high and roughly ten metres across, it is easy to walk past without a second glance, yet it represents a technology that was repeated across the Irish landscape for thousands of years.

A fulacht fia is a type of ancient cooking or heating site, typically consisting of a mound of fire-cracked stones beside a trough and a water source. The method was straightforward: stones were heated in a fire and then dropped into a water-filled trough, bringing the water to a boil rapidly and repeatedly. Here at Glenmagoo, the site occupies level ground at the south-eastern end of a north-to-south ridge, with a stream nearby that was deepened at some point into a drain. The depression at the southern end of the mound, measuring roughly two metres in each direction, most likely marks where the trough once sat. What makes this particular site quietly remarkable is not just its own survival, but its company. Two further fulachta fia lie within eight metres of it, one to the south-west and one to the north-east, suggesting that this stretch of former wetland was used repeatedly, and perhaps over a long period, by people who found the combination of level ground, water, and proximity to the ridge reliably useful.