It belongs to a class of monument known as a fulacht fia, a type of site found in great numbers across Ireland, typically interpreted as ancient cooking places where stones were heated in a fire and then dropped into a water-filled trough to bring it to the boil. The process left behind exactly what survives here: a crescentic heap of burnt and shattered stone, built up over repeated use, curving around the trough that was the whole point of the operation.

The site at Ballyganner sits at the base of a steep north-facing slope, set within a northeast-to-southwest ravine where limestone pavement lies beneath a cover of trees and grass. The mound itself measures roughly 11.5 metres east to west and about 5 metres north to south, opening to the north to partly enclose a very distinct stone-lined trough, approximately 2.3 metres by 1.4 metres, with upright stones marking its southern edge. The western arm of the mound rises to an external height of around 0.9 metres, the eastern arm to a more modest 0.1 metres, giving the whole structure an asymmetric, weathered profile. The burnt stones are small; the unburnt stones scattered through the mound run to about 23 centimetres across. The site sits within a large multiperiod field system, meaning the landscape around it bears the marks of human use across several different eras, the fulacht fia being simply one layer among many.