It rises only about 0.6 metres at its highest point, overgrown and easy to overlook, but it represents a type of site found in the hundreds across Ireland. This is a fulacht fia, a term used for the horseshoe-shaped mounds of fire-cracked stone that mark the sites of prehistoric cooking places. The usual interpretation is that water was heated in a trough by dropping stones, heated in a fire, directly into the liquid. The spent, shattered stones were then raked aside, accumulating over repeated use into the distinctive mound that survives today.

What makes the Ballyfadeen Beg site quietly interesting is its company. A second fulacht fia lies approximately 40 metres to the south-east, suggesting that this particular stretch of marshy ground beside the stream was returned to repeatedly, perhaps by different groups or across different periods. The marshy, waterlogged setting is entirely typical. Fulachtaí fia, as they appear across Ireland and Britain, are almost always found near reliable water sources, and the soft, boggy ground that makes them difficult to farm has often been the reason they survive at all, left undisturbed in corners of fields that resisted the plough.