To a passing eye it reads as nothing more than a slight unevenness in the pasture. What it represents, however, is a fulacht fia, one of the most common and yet persistently puzzling monument types in the Irish archaeological landscape.

A fulacht fia is essentially the debris left behind by a prehistoric cooking or heating site. The typical arrangement involved a trough filled with water, into which stones heated in a nearby fire were dropped to bring the water to a boil. Over repeated use, the cracked and spent stones accumulated into a mound, often horseshoe-shaped, frequently damp, and almost always found close to a water source. The proximity of the Knockmanagh example to a well fits this pattern almost exactly. These sites are dated broadly to the Bronze Age, though some continued in use into later periods, and they appear in their thousands across Ireland, concentrated in low-lying, wet ground. What they were used for, whether cooking large joints of meat, processing hides, bathing, or some combination of purposes, remains a matter of ongoing debate among archaeologists.