What survives is not a wall, not a bank, but a cropmark, the faint ghostly outline of a fosse (a defensive or boundary ditch) that only became legible from the air during an aerial survey in July 1989. The roughly oval shape, measuring around 25 metres in diameter, is incomplete even as a cropmark; a field fence has clipped its western side, and the fosse dips slightly inward toward the north-north-east. It is the kind of site that rewards patience with aerial photography rather than a visit with walking boots.

Cropmarks appear when buried features like ditches or pits affect the growth of overlying vegetation or crops, with differential moisture retention causing subtle variations in colour or height that become readable from altitude but are invisible at ground level. The Killetra enclosure belongs to a broader cluster of prehistoric activity in this part of North Cork. Roughly 60 metres to the west lies a fulacht fiadh, a type of burnt mound associated with ancient cooking or industrial activity, typically identified by a spread of heat-shattered stone. Two further enclosures sit to the south-east, one about 90 metres away, another around 175 metres distant, suggesting this was not an isolated farmstead or ceremonial feature but part of a landscape that was meaningfully organised over a long period. The proximity of several such sites to one another is a recurring pattern in Irish prehistory, and it hints at sustained use of particular territories rather than sporadic settlement.