These sites, found in their thousands across Ireland, are generally dated to the Bronze Age and are associated with the practice of heating water by dropping fire-cracked stones into a trough. The burnt and shattered stone accumulates over time into a horseshoe-shaped mound, often found close to a stream or boggy ground. They are easy to walk past without a second thought, which is part of what makes them quietly compelling.

The Cangullia example sits within a county already dense with prehistoric remains, from promontory forts along the Iveragh Peninsula to early Christian sites scattered across the hills. Fulachtaí fia as a class have attracted considerable debate among archaeologists: while cooking is the most widely accepted explanation for their function, other theories have proposed brewing, textile processing, or bathing. None has been conclusively proved or disproved. What is consistent across almost all excavated examples is the pairing of water and heat, and the patient, repeated accumulation of that distinctive cracked stone.