What remains is still legible: a spread of scorched material measuring about seven metres north to south and nearly as wide east to west, rising to just under three quarters of a metre at its highest point. A slight hollow marks the southern side, and where a drain cuts along the north-west edge of the mound, a cross-section reveals burnt material to a depth of sixty centimetres, suggesting considerably more survives below the surface than the modest profile implies.

This is a fulacht fia, a type of site found in enormous numbers across Ireland, particularly in low-lying ground near water. The term, loosely translated from Old Irish, refers to a cooking place, and the mounds are the accumulated debris of a process that involved heating stones in a fire and plunging them into a water-filled trough to bring it to a boil. The burnt and shattered stones, cracked by repeated thermal stress, were raked out and discarded, building up over time into the characteristic horseshoe-shaped or oval mounds that survive today. Most date to the Bronze Age, roughly 1500 to 500 BC, though some examples span a wider range. The site at Lackeel was recorded by Bowman in 1934, who observed even then that the burnt stones visible on the surface had already been removed, most likely cleared away for agricultural use or building material at some earlier point. Redeposited burnt material noticed in a gap in the nearby field fence to the north hints at how far the disturbance may have spread.