That absence alone is quietly telling. The site consists of a semi-circular ditch, roughly 1.6 metres wide and 0.4 metres deep, enclosing what was once a more substantial area stretching approximately 54 metres on a north-east to south-west axis. What remains is, by most estimates, only a fraction of the original structure. The cliffs have done the rest, gradually consuming the greater part of the enclosure over an unknown span of time.

Enclosures of this kind, defined by a surrounding ditch or bank, are a common enough feature of the Irish archaeological landscape, serving in different periods as settlement boundaries, animal enclosures, or ceremonial spaces. What makes Clashmelcon unusual is the combination of its cartographic invisibility and its ongoing erasure. Cliff erosion is a slow but relentless process along this stretch of the Kerry coast, and the enclosure at Clashmelcon appears to have been losing ground to it for long enough that most of the structure is simply gone. The surviving arc of ditch represents the inland edge of something much larger, the seaward portions having collapsed or slipped away entirely. The site was documented in the North Kerry Archaeological Survey by C. Toal, published in 1995, which remains the principal record of what can still be observed.