A fulacht fia is, in essence, a burnt mound, the accumulated debris of repeated episodes of heating stones in fire and plunging them into water-filled troughs, most likely for cooking. The process leaves behind a characteristic horseshoe or kidney-shaped heap of cracked, fire-blackened stone, and in the landscape around Lisleagh, that residue has survived in reclaimed pasture on the southern bank of a small stream.

What makes this particular example quietly interesting is both its condition and its company. The mound is an irregular, overgrown scatter of burnt material, cut through by two parallel field drains running east to west and crossed by a field fence that has itself been built partly from the burnt stone, the kind of unselfconscious recycling that has happened to prehistoric sites across Ireland for centuries. It is not alone: three other fulachta fiadh sit in the same cluster nearby, suggesting that this stretch of stream was returned to repeatedly, perhaps over generations, for whatever activity these monuments represent. The proximity to water is characteristic; the stream would have been essential, either as a direct water source for the trough or simply as a reliable landmark in a working landscape.