It is not much to look at, measuring roughly twelve metres north to south and fourteen metres east to west, but what it represents is a kind of prehistoric kitchen that was once scattered across the Irish landscape in extraordinary numbers. This is a fulacht fia, the remains of an ancient outdoor cooking site, typically Bronze Age in date, where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil. The cracked and blackened stone that resulted was discarded into a growing heap beside the trough, which is precisely what forms the characteristic horseshoe-shaped mounds still visible in fields across Ireland today.

What makes Ballymacphilip particularly striking is not this single mound but the company it keeps. A second fulacht fia lies immediately to its north-east, a third sits roughly ten metres to the north-north-east, and two further examples are recorded close by in the same area, giving a cluster of at least five of these sites within a small stretch of ground. Whether that density reflects repeated use of a favoured location over many generations, or perhaps a period of intensive activity by a single community, is not something the physical remains alone can settle. Clusters of fulachta fiadha are known elsewhere in Ireland, and some researchers have suggested they may indicate seasonal gathering places or sites associated with communal activity beyond simple cooking, though debate on that question continues.