This is a cashel, an early medieval stone enclosure of the kind built across the west of Ireland, typically as a defended farmstead or the residence of a local lord. What sets this one apart is sheer mass: the surrounding drystone wall stretches roughly 27 metres east to west and 25 metres north to south, and where it survives it measures 4.5 metres wide and up to 2.5 metres in height.

Recorded by Cody in 1989, the site presented a particular asymmetry even then. The outer face of the wall was well-built and largely intact, its careful construction still legible after more than a thousand years. The inner face, however, had largely collapsed or become buried, and the interior of the enclosure was dense with vegetation. That contrast, a composed exterior concealing a disordered interior, is not unusual in cashels that have gone unmanaged for centuries, but it does give Cahermore a quality of incompleteness, as though the structure is still in the middle of deciding what to reveal.