What makes this particular site quietly arresting is the sheer improbability of it: somebody, at some point, chose this tiny islet in a lake as a place worth enclosing and defending, and the structure they left behind has been sitting there, overgrown and largely unvisited, ever since.

The island is known locally as An Chraoibhín, a diminutive Irish name suggesting something small and branching, perhaps a reference to the scrubby vegetation that has always colonised it. The cashel wall is built from drystone construction, meaning the stones are carefully fitted together without any binding mortar, a technique common across early medieval Ireland. Most striking among its remaining fabric is a massive split granite boulder incorporated into the eastern stretch of the wall, clearly used by the original builders as a ready-made structural element rather than quarried or shaped stone. The interior of the enclosure is uneven and rises toward the centre, which, combined with the overgrowth, makes reading the space difficult. The site was noted by Layard as early as 1897, and later recorded by Tim Robinson in 1985, whose meticulous mapping of Connemara brought many such overlooked features to wider attention.