The one recorded here is a horseshoe-shaped mound of burnt material, roughly 11.8 metres along its northeast to southwest axis and about 8 metres across, rising only 0.45 metres above the surrounding ground. Its opening, just under 3 metres wide, faces northeast, and it sits at the base of a northeast-facing slope.

A fulacht fia, the plural being fulachtaí fia, is a type of ancient cooking site found in enormous numbers across Ireland, typically dated to the Bronze Age. The standard interpretation is that stones were heated in a fire and then dropped into a trough of water to bring it to a boil, which produced the characteristic mounds of cracked, fire-blackened stone that survive today. What makes the Caher site quietly compelling is its proximity to two others of the same type, one lying just 7.5 metres to the north and another only 1.5 metres to the west. Whether that clustering reflects repeated seasonal use of a particularly convenient spot, or something more organised, is not recorded, but the grouping is unusually tight even by Irish standards, where fulachtaí fia are rarely found in true isolation.