They appear as low, horseshoe-shaped mounds, typically found near water, and are generally dated to the Bronze Age, roughly 1500 to 500 BC. The prevailing theory holds that they functioned as outdoor cooking sites: a trough dug into the ground and lined with wood or stone would be filled with water, and fire-heated rocks dropped in to bring it to the boil. Over repeated use, the cracked and shattered stones were raked aside, gradually building up the characteristic mound around the trough. The example at Creagh Demesne in County Mayo is one such site, quietly occupying its place within the bounds of a demesne landscape that overlays, as so often in Ireland, considerably older activity beneath.

Creagh Demesne itself suggests an estate landscape, the word demesne referring to land retained for the direct use of its owner rather than leased out to tenants, a common feature of post-medieval landholding across Ireland. That a Bronze Age cooking site survives within such a setting is not unusual; fulachta fia are frequently encountered on estate and farmland throughout the country, their mounded form substantial enough to persist through centuries of agricultural use. What draws the attention here is simply the layering, a prehistoric site embedded within a named, bounded landscape whose own history reaches back through the complexities of Irish land ownership. The specific details of the Creagh site, its dimensions, condition, and precise location within the demesne, remain to be fully documented.