That kind of grouping is quietly telling. Fulachtaí fia, the plural form, are among the most common prehistoric monument types in Ireland, characterised by their distinctive horseshoe-shaped mounds of fire-cracked stone and charcoal, the burnt debris left behind after repeated cycles of heating stones and plunging them into water-filled troughs to bring the water to a boil. The monument at Caher sits at the base of a north-facing slope, a low crescent of scorched material measuring roughly nine metres north to south and eight metres east to west, rising just over half a metre from the surrounding ground. Its opening, about three metres across, faces west.

What makes the Caher site worth a second look is the density of its immediate neighbourhood. Two further fulachtaí fia sit within a few steps of this one, the nearest only three metres to the east, the other five metres to the west-northwest. Whether they represent broadly contemporary use, sequential activity returning to a favoured spot, or something more episodic is not recorded here, but the proximity suggests this low slope beside whatever water source once ran nearby was returned to, repeatedly and deliberately. The reclaimed pasture setting is typical; these sites are most often found in low-lying, wet ground, which makes sense given that access to a reliable water supply was central to how they functioned.