This is a fulacht fia, a type of prehistoric cooking or processing site found in great numbers across Ireland, typically Bronze Age in origin. The basic idea was straightforward: stones were heated in a fire, dropped into a water-filled trough to bring it to the boil, then discarded when they cracked from the thermal shock. Repeated over time, those shattered stones and the charcoal-rich soil around them accumulated into the distinctive mound visible today.

The mound at Drom measures 8.5 metres north to south and 4.8 metres east to west, rising to a height of 0.7 metres. Its opening, just over a metre wide, faces east. The shape and composition are typical of the form: heat-shattered stone and darkened, charcoal-enriched soil built up through sustained, repeated use rather than deliberate construction. What is less easy to explain is why so many fulachtaí fia appear in boggy, marginal ground. The bog itself may have preserved what was once open land, or the proximity to water may simply have been the practical priority. The blanket bog surrounding this example has, in any case, done the work of preservation, keeping the mound largely intact and readable in the landscape even now.