The western arm of a prehistoric fulacht fia on the north-western bank of the Pollbrandy stream in Lecarrow was buried and disturbed by drainage work, leaving only one side of what was once a horseshoe-shaped mound to mark the spot. The surviving arm still rises to a height of 0.85 metres, but the opposing arc is gone from the surface entirely, its burnt stone now visible only where the stream bank has been cut away, exposing the debris in cross-section.

A fulacht fia is a type of burnt mound, one of the most common prehistoric monument types in Ireland. The basic principle involved heating stones in a fire, dropping them into a water-filled trough to bring the water to a boil, and using that heat for cooking, bathing, or various craft processes. The characteristic crescent or horseshoe shape comes from the gradual accumulation of discarded, heat-shattered stone around the central trough. At Lecarrow, the monument was positioned on sloping ground beside the Pollbrandy stream, opening southward toward the water, which would have supplied the trough directly. The original stream course at this point remains intact, making it possible to read the relationship between the monument and its water source much as it would have existed when the site was in use. Immediately upstream, however, the natural channel gives way to a modern drainage cut, and it is spoil from that work which obscures the western arm of the mound. The trough area itself appears largely undisturbed and shows a surface exposure of burnt stone at its summit, the fractured, fire-cracked material that is the diagnostic fingerprint of these sites across the Irish landscape.