To the untrained eye it reads as little more than a slight rise in wet ground, but beneath the turf lies a spread of burnt and fire-cracked stone, the characteristic signature of a fulacht fia.

A fulacht fia, sometimes spelled fulacht fiadh, is a type of ancient outdoor cooking place found across Ireland in considerable numbers. The typical arrangement involved a trough, often timber-lined or cut into the earth, filled with water, into which stones heated in a nearby fire were dropped to bring the water to a boil. The discarded, shattered stones accumulated over repeated use into a horseshoe-shaped mound, and it is precisely this kind of spread that survives at Charlesfield. What makes the site quietly notable is that a second fulacht fiadh lies immediately to its south-west, suggesting this stretch of marshy ground saw repeated or sustained prehistoric activity rather than a single isolated episode. Marshy locations are typical for these sites, since a reliable source of water was essential to the whole process, and the low-lying, seasonally wet ground here would have suited that purpose well.