It measures roughly five metres by eight and a half, and rises no more than about thirty-eight centimetres at its highest point. A stream runs past some twenty metres to the south. To the casual eye, it is barely a feature in the landscape at all.

What it represents, however, is one of the most common prehistoric monument types in Ireland. A fulacht fia is essentially a burnt mound, the accumulated debris of an ancient cooking or heating method in which stones were repeatedly heated in a fire and then dropped into a trough of water to bring it to the boil. The crescent or horseshoe shape so typical of these sites is formed by the discarded cracked and fire-shattered stones, piled up over many uses into a mound surrounding the original trough. They are found in their thousands across Ireland, almost always in low-lying, wet ground near a water source, and the example at Ballyphilip fits that pattern with quiet precision. The waterlogged areas to its northwest and south, and the nearby stream, are exactly the kind of hydrological setting these sites consistently favour. Most fulachtaí fia date to the Bronze Age, though some were in use earlier or later, and their precise function, whether for cooking, bathing, textile processing, or some combination, has been a matter of ongoing discussion among archaeologists.