Walk across the pasture today and you would find nothing to indicate that anything lies beneath your feet. The site survives only as a cropmark, a phenomenon where buried ditches and banks cause subtle differences in the rate at which grass or grain grows above them, differences that become legible only from the air. Aerial photographs reveal a circular enclosure roughly forty metres in diameter, its outline defined by a single fosse, meaning a ditch dug around a central living area. This is the basic anatomy of a rath, the most common type of early medieval ringfort in Ireland, typically constructed between around 500 and 1000 AD as a farmstead enclosed for the protection of people and livestock.

The cropmark circle is not quite complete. A field bank running roughly north-west to south-east cuts across the south-western arc, truncating the original outline, and there is a gap on the north-eastern side. Whether that north-eastern gap was always an entrance, or whether it represents later disturbance, the aerial evidence alone cannot say with certainty. What the photographs do confirm is that centuries of agricultural activity, the laying out of field boundaries across older, forgotten ones, have gradually erased the visible trace of what was once a defined and inhabited space. The flat, undemanding landscape around Duncormick gives no hint of any of this at ground level.