There are at least five of them, and possibly closer to a dozen, though the less distinct examples were left unrecorded. To the untrained eye they might read as nothing more than uneven pasture, but each contains the same telltale fill: burnt stone and blackened soil, the unmistakable signature of prehistoric cooking activity.

These are fulachtaí fia, a type of site found in enormous numbers across Ireland, typically dating to the Bronze Age. The standard interpretation is that they served as outdoor cooking places: stones were heated in a fire, dropped into a water-filled trough to bring it to the boil, and meat was cooked in the resulting hot water. The cracked and heat-shattered stones were then discarded to the side, accumulating over repeated use into the low horseshoe-shaped mounds that survive today. The sites almost invariably appear near water, and Clahane is no exception. A small stream running along the western edge of the field is a tributary of the River Lee, and the ground itself is described as very wet, prone to seasonal flooding. That proximity to water was not incidental; it was essential to the whole operation. The most clearly defined of the Clahane mounds sits in the south-west corner of the field. It is nearly circular, measuring roughly ten metres north to south and twelve metres east to west, and rises about half a metre above the surrounding ground. Its trough, now heavily overgrown with reeds, opens to the south-west and drops around thirty-five centimetres below the top of the mound. The concentration of at least five confirmed sites, with further possible examples nearby, suggests this wet corner of Kerry was used repeatedly and perhaps intensively over a long period.