They appear as low, horseshoe-shaped mounds, typically found near water, and are generally dated to the Bronze Age, roughly 1500 to 500 BC. The working theory is that they were cooking sites: stones were heated in a fire, dropped into a water-filled trough to bring it to the boil, and used to cook meat. Some researchers have proposed other uses, from textile processing to brewing, though cooking remains the most widely accepted explanation. The example recorded at Abbeylands in County Kilkenny is one of many such sites quietly present in the farmland and margins of the Irish midlands and south-east.

Abbeylands itself is a townland whose name hints at an earlier ecclesiastical presence in the area, though the fulacht fia almost certainly predates any monastic activity by well over a thousand years. Without more detailed excavation records it is difficult to say much about this particular mound, its dimensions, or whether any artefacts were recovered nearby. What can be said is that the concentration of fulachta fia across County Kilkenny reflects a Bronze Age landscape that was far more densely settled and actively managed than the quiet fields above them now suggest. Each mound represents repeated, organised activity, return visits to the same spot, the accumulation of fire-cracked stone over many seasons or generations.