It measures nineteen metres long, over thirteen metres wide, and rises less than a metre from the surrounding ground, its north-eastern face open in a broad gap some five metres across. Cattle have worn the surface down over the years, yet the mound persists, dark with burnt material and largely unremarked by anyone passing through.

This is a fulacht fia, a type of prehistoric cooking site found in great numbers across Ireland, typically dating to the Bronze Age. The usual interpretation is that water was heated in a trough by dropping fire-cracked stones into it; those stones, once spent, were piled up around the trough, forming the characteristic mound of scorched and fragmented rock that survives in the landscape today. The marshy setting here is entirely typical: fulachtaí fia cluster near water sources, and the proximity of a well reinforces the logic of the location. What makes Ballynaboul quietly interesting is not just the site itself but its company. A second fulacht fia lies roughly a hundred and twenty metres to the north-west, suggesting that this particular stretch of ground was returned to repeatedly, perhaps across generations, for whatever purpose these sites served. The presence of two within such close range of each other is not unique in Ireland, but it is a detail worth pausing over, a suggestion that the landscape here held some particular appeal or utility for the people who worked it.