The straight side of the D, running some 37 metres along the south-east, is not a built wall at all but the exposed face of a natural rock outcrop, incorporated into the enclosure's boundary as though whoever laid it out recognised a ready-made foundation when they saw one. The remaining arc, curving around to the north and north-east, is an earthen bank, heather-covered now and worn down to roughly half a metre in height, from which upright stones protrude at irregular intervals like pegs left in a hem. The overall span, about 18 metres from north-west to south-east, makes it modest in scale.

Enclosures of this type are a common enough feature of the Irish archaeological record, though their precise functions and dates are often difficult to pin down. Some enclosed livestock, some defined domestic or ceremonial space, and many did both at different points in their history. The sheep-gaps still visible in the bank at Tilickafinna suggest the enclosure was pressed into agricultural use at some point, whether or not that was its original purpose. Inside the south-east portion of the interior there is a hut site, a low spread of collapsed stone or earthwork marking where a simple roofed structure once stood, which hints at a human presence more settled than seasonal herding alone would require. The combination of enclosing bank and internal hut is a pairing found across early medieval and later prehistoric sites throughout Munster, though without excavation it is impossible to assign a confident date to this particular example.

Dursey Island itself, reached by cable car from the Beara Peninsula, is Ireland's only inhabited island served by such a crossing, and the terrain is genuinely rough in places. The enclosure lies on the upper slopes above Tilickafinna, and the heather-covered bank blends readily into the surrounding pasture, so it rewards a slow look rather than a glance from the path. The protruding upright stones along the northern arc are the clearest visual marker once you are close.