Roughly 25 metres across, the enclosure is the kind of feature that disappears entirely at ground level, absorbed into the ordinary rhythms of a working farm, but resolves into something more deliberate when seen from above.

Square or rectangular enclosures are comparatively rare in the Irish archaeological record, where circular forms, the familiar ring-forts and cashels of the early medieval period, dominate. That geometric regularity tends to attract attention, since it can suggest ecclesiastical origins, a enclosed monastic plot or a managed garden ground, though it may also reflect later agricultural or estate activity. At Caherminnaun, the enclosure has not been formally classified; it remains a possibility, something the aerial signature raises without yet resolving. The eastern field boundary, which now doubles as one wall of the feature, is the sort of detail that hints at long continuity, later land division quietly inheriting and reusing an earlier line in the ground.