The mound is horseshoe-shaped, measuring roughly six metres north to south and five and a half metres east to west, rising only about forty centimetres above the surrounding ground. Its opening faces north-west. What makes it immediately interesting is not its size or drama but its company: two further examples of the same type sit just three metres to the west and one and a half metres to the east, making this a tight cluster of three monuments practically shoulder to shoulder.

A fulacht fia is a type of ancient cooking or processing site found in enormous numbers across Ireland, typically dating to the Bronze Age, though some examples fall outside that range. The characteristic form is a horseshoe or kidney-shaped mound composed of fire-cracked stone and charred material, the debris from repeated cycles of heating stones in a fire and dropping them into a water-filled trough to bring the water to a boil. The trough itself, usually timber-lined and sunk into the ground, rarely survives visibly, but the surrounding mound of discarded burnt stone is almost indestructible. The Caher example preserves that form clearly, its opening marking where the trough would once have sat. The fact that three such sites cluster so closely together here is unusual; fulachtaí fia are common across the Kerry landscape, but this kind of near-adjacency suggests repeated, possibly sustained activity at one particular spot, perhaps drawing on a nearby water source at the slope's base.