A fulacht fia, at its most basic, is an ancient cooking site, typically identified today as a low, horseshoe-shaped mound of burnt and fire-cracked stone. The mound is the accumulated debris of repeated heating: stones were fired in a hearth and dropped into a water-filled trough, bringing the water to a boil without direct flame. Over time, the spent, shattered stones were raked aside and piled up, forming the distinctive crescent shape that survives in the ground long after everything else has vanished.

Ireland has more recorded fulachtaí fia than anywhere else in Europe, with estimates running into the tens of thousands. Most date to the Bronze Age, roughly 1500 to 500 BC, though some examples have been dated earlier or later. The Derroograne site sits within a county that is particularly dense with them; Cork's boggy, well-watered lowlands provided exactly the conditions these sites required, namely a reliable source of groundwater close to the surface and plentiful timber for fuel. The townland name Derroograne derives from the Irish, and like many Cork placenames carries within it a layered record of landscape and usage that long predates any written account.