These low, horseshoe-shaped mounds of burnt and shattered stone are found in boggy ground throughout the country, and the one at Maghasheela in County Kerry is a local example of a monument type that appears in almost every townland, yet still prompts genuine disagreement about what it was actually for.

The basic mechanics are reasonably well understood. A fulacht fia typically consists of a mound of fire-cracked stone built up beside a trough, usually timber-lined or cut into the ground, which would have been filled with water. Stones were heated in a fire and dropped into the trough to bring the water to a boil, and the discarded, fractured stones gradually formed the characteristic crescent mound. Dating evidence from sites across Ireland places most fulachtaí fia in the Bronze Age, roughly between 1500 and 500 BC, though some are earlier and some later. The prevailing theory for much of the twentieth century was that they functioned as cooking sites, giving rise to the loose translation of the name as "cooking place of the deer." More recent proposals have suggested brewing, textile processing, or bathing as equally plausible uses, and the debate has not been settled. The sheer number of these sites, estimated at over four thousand recorded examples in Ireland alone, suggests they were a routine and widespread feature of prehistoric life rather than something ceremonial or exceptional.

The Maghasheela example sits within a county that has an exceptionally dense concentration of prehistoric monuments, owing in part to Kerry's relative remoteness from later large-scale agricultural development, which elsewhere destroyed so much of the archaeological record. The townland name itself, derived from the Irish, points to the layered place-name history that so often accompanies sites of this kind in the south-west.