It is not quite that. The enclosure at Knockroe measures roughly eleven metres along its north-to-south axis and nine and a half metres across, defined by an earth-and-stone bank that survives on three sides and curves gently outward on the west, giving it an outline that is almost, but not quite, regular. That slight irregularity, combined with the landscape it sits in, gives the place a quality of quiet deliberateness.

The structural details recorded by Denis Power, and uploaded to the survey record in November 2013, reward a closer look. The bank along the eastern side is the longest surviving stretch at ten metres; the northern and southern sides run to just under nine metres each. Along the interior face of the northern bank there is evidence of stone facing, suggesting that whoever built this took some care in its construction. A possible entrance, about two metres wide, is visible in the southern side, which is a typical placement for enclosures of this kind, orientated to catch the most light from the lower part of the sky. On the western exterior there is a faint trace of a fosse, the term for a shallow ditch dug to reinforce a bank, though this one is modest, barely fifteen centimetres deep and just over three metres wide. Two breaks in the northern bank look recent rather than original. The interior itself slopes downward following the natural gradient of the hillside. Old field boundaries running roughly north to south extend from the northern side and appear again near the south-east corner, suggesting the enclosure was at some point folded into a wider pattern of agricultural land division.

Knockroe is not a place with visitor infrastructure. Finding the enclosure requires some familiarity with the local terrain, and the glaciated valley setting means the ground can be soft and uneven underfoot, particularly after rain. The cliff face to the north-east provides a useful orientation point once you are in the valley. The curving western bank and the faint fosse outside it are the most legible features from ground level; the stone facing on the northern interior is subtle and worth looking for specifically rather than expecting it to announce itself.