A low, semicircular mound, barely forty centimetres at its highest point on the north-eastern side, opens towards the water. Most of it has faded almost imperceptibly into the surrounding flat terrain, leaving only that one arm still legible as a distinct shape. It is the kind of site that asks a great deal of the eye.

This is a fulacht fia, a type of prehistoric cooking site found in enormous numbers across Ireland, typically Bronze Age in origin. The usual arrangement involved a timber or stone-lined trough filled with water, heated by dropping fire-cracked stones into it until the water boiled. Those split and shattered stones, dumped repeatedly to the side, formed the characteristic horseshoe-shaped mound that survives at sites like this one. At Lecarrow, the evidence of that process is still visible in cross-section: where the modern stream cutting slices through the bank, a thin but extensive layer of burnt stone is exposed, with particular concentrations where the arms of the mound approach the water's edge. Close to the north-western arm, a dense pocket of charcoal sits roughly half a metre below the present ground surface, likely the remnant of a hearth or burning area associated with the site's use. A single revetment stone, the kind used to face and stabilise the inner trough area, protrudes from the sod near the centre of the mound.

What makes the site at Lecarrow especially interesting is the question it leaves open. On the opposite, north-western side of the stream cutting, a further concentration of burnt stone some 6.5 metres long and 0.6 metres thick has been recorded. It may be part of the same fulacht fia, spread across what was once a narrower or differently routed watercourse, since no trace of the original stream channel survives. Equally, it could represent a second, separate mound. The modern cutting at this point measures 4.5 metres wide, enough of a gap to make the relationship genuinely uncertain. The original source of water, the stream's old course, has been entirely lost to drainage and landscape change, leaving the site slightly disconnected from the geography that once gave it purpose.