It measures twelve metres long, ten metres wide, and barely half a metre high, which means it is easy to overlook unless you already know what you are looking for. What it represents, however, is one of the most intriguing recurring features of the Irish Bronze Age countryside.

This is a fulacht fia, a type of ancient cooking site found in enormous numbers across Ireland, with County Cork alone containing hundreds of recorded examples. The characteristic horseshoe or kidney shape comes from the gradual accumulation of fire-cracked stone and charcoal, discarded over repeated use. The typical method involved heating stones in a fire, then dropping them into a water-filled trough to bring it to a boil, a process efficient enough to cook large joints of meat. The spring recorded close to this particular mound would have been essential to that process, providing a reliable water source right beside the site. This relationship between fulachta fía and natural water sources, whether springs, streams, or boggy ground, is so consistent across Ireland that it is now considered one of the defining characteristics of the monument type. The Farranastig example was noted by Walsh in 1985, and it fits neatly into that broader prehistoric pattern of communities making use of the wet, spring-fed margins of the landscape.