That combination of form and position is the whole point. This is a fulacht fia, a type of prehistoric cooking site found in considerable numbers across Ireland, typically Bronze Age in date, and almost always positioned close to a water source. The usual interpretation is that stones were heated in a fire, then dropped into a water-filled trough to bring it to boiling point, with the cracked and shattered burnt stone gradually accumulating into the characteristic horseshoe or, in this case, heart-shaped mound that survives today.

The site at Uragh sits beside a second fulacht fia, the two monuments occupying the same stretch of riverbank in close proximity. Whether they were in use at the same time, or represent separate episodes of activity at a spot that was simply well suited to the purpose, is not recorded. What is clear from the physical description is that whoever returned to this place understood the logic of the location: the river immediately accessible through that south-western opening, the mound building up over repeated use into its present low but legible profile, half a metre high and composed entirely of the spent, fire-cracked material that accumulates when the same process is carried out again and again over time.