A fulacht fia, to explain the term, is a Bronze Age burnt mound, the accumulated remains of a repeated open-air cooking method in which stones were heated in fire and dropped into a water-filled trough until it boiled. The discarded, heat-shattered stones built up over time into the characteristic low, horseshoe-shaped mounds that survive across the Irish landscape in their thousands, almost always in wet, low-lying ground near a water source.

The example at Fahee is small even by the standards of these modest monuments: roughly 5.5 metres east to west and 4 metres north to south, rising only half a metre or so above the surrounding ground. It takes the typical crescent form, open to the north, and is composed of burnt stone with a single set stone at the north-east corner, partly enclosing a shallow central area around 2 metres by 1.4 metres and roughly 0.4 metres deep. A small stream runs to the south-south-east, which would have provided the water the whole process depended upon. Higher ground rises to the north, east, and south-east. The site was reported independently by Tom Coffey and Donncha Ó Dúlaing, and was formally listed in the Record of Monuments and Places in 1996. What makes Fahee more than a routine entry is the density of activity it implies: two further fulachtaí fia sit within 35 metres to the north-west, and a fourth lies about 155 metres to the south-east. Whether these represent repeated use of a favoured landscape over generations, or something more organised, is not yet clear, but the concentration is unusual enough to prompt the question.