Nothing is visible at eye level, but from the air, the soil gives it away. A curved line, running east to west along the southern side of a field boundary, shows up as a cropmark, the kind of subtle discolouration in growing crops that betrays a buried feature below. In this case, the arc appears to trace the southern edge of a circular enclosure, roughly 25 metres in diameter, whose fosse, the defensive or boundary ditch that once surrounded it, has been filled in over centuries but never quite forgotten by the earth above it.

The feature came to light in an aerial photograph taken in July 1989 as part of the Cork Archaeological Survey Aerial Photography programme. Cropmarks form when buried ditches or pits retain more moisture than the surrounding soil, causing the vegetation above them to grow slightly differently, taller or greener in dry conditions, and this contrast becomes legible only from altitude, often only in particular seasons or weather. What the 1989 photograph captured was not the enclosure itself but its shadow in the landscape. The full circuit of the fosse is not visible, only an arc on the southern side, which makes a precise identification tentative. What can be said is that the dimensions, around 25 metres across, are consistent with the kind of small circular enclosures found widely across Ireland, often associated with early medieval settlement or activity. Notably, a ring-ditch sits roughly 100 metres to the south-south-east, hinting that this corner of Kilcummer may have seen sustained use across a long period.