It is a fulacht fia, a type of prehistoric cooking or processing site found in great numbers across Ireland, typically identified by the distinctive horseshoe-shaped mounds of burnt and shattered stone left behind when heated rocks were repeatedly plunged into water-filled troughs. This one has resisted easy study, swallowed by vegetation and soft ground, its outline indeterminate.

What makes the Farran site quietly notable is the company it keeps. Roughly 150 metres to the north-east stands a prehistoric standing stone, a single upright monument whose relationship to the fulacht fia, if any, remains unexamined. More striking still, a second fulacht fia lies approximately 100 metres to the south, suggesting that this stretch of marshy streamside ground was returned to, perhaps repeatedly, by people who found it a practical place to work. The pairing is not unique in the Irish record, wet ground being precisely the environment these sites favour, but two examples in such close proximity, both unexcavated and overgrown, gives the area an odd density of prehistoric activity that the landscape gives no outward sign of today.