What makes it unusual is precisely what is missing: there is no corresponding bank completing the circuit. Only one curved section survives, or perhaps only one curved section ever existed, which raises the question of whether this was ever a proper enclosure at all.

If it is the remnant of an enclosure, the internal diameter would have been around eight metres, which is quite modest. Enclosures of this general type, formed from earthen banks rather than stone, were constructed across Ireland from the early medieval period onward and served a variety of purposes, from livestock management to the demarcation of a dwelling or a small farmstead. The Dingle Peninsula is rich in such earthworks, many of them catalogued as part of the Corca Dhuibhne archaeological survey compiled by J. Cuppage and published in 1986. That survey recorded this feature at Glanmane, noting the incomplete arc and the absence of any trace of the bank continuing around the remainder of the perimeter. Whether that absence reflects centuries of erosion, agricultural clearance, or simply the original form of the feature remains an open question.