That dramatic variation is not the result of neglect alone; it is largely the work of the outcrop itself. The caher, a type of stone-walled ringfort built without mortar, sits directly on the rock, and its enclosing wall simply follows the natural slope beneath it, climbing and falling with the terrain. The effect is a structure that seems simultaneously massive and half-vanished depending on where you stand.

The fort commands the mountain pass between Bolus and Canuig on the Iveragh Peninsula, a position that suggests it was chosen with some care for what it overlooked. Its interior measures roughly fourteen and a half metres across, enclosed by walls of irregularly shaped stones laid in rough courses, well-built but not finely dressed. What makes the site particularly curious is a lintelled opening set into the southern face of the wall, about a metre and a half above the base of the outcrop, leading into a souterrain, an underground or semi-underground stone-lined passage typically associated with early medieval settlement and possibly used for storage or concealment. The passage runs northeast for at least two metres before bending northwest, where a researcher named Lynch recorded in 1902 that it once rose back up into the interior of the enclosure. That interior connection can no longer be traced, and the passage itself is no longer accessible beyond the bend. Inside the caher, loose stones litter the ground, with three small upright slabs grouped towards the west. Just outside the northeast of the wall, a fallen standing stone lies flat on the ground, its original purpose unrecorded but its presence adding another quiet layer to an already layered site.