The site is a sub-rectangular enclosure, roughly 67 metres along its northwest to southeast axis and around 40 metres across, and it survives only as the cropmark of a fosse, the filled-in ditch that once defined its boundary. A fosse of this kind is the negative space of a former earthwork: the ditch was dug, accumulated centuries of sediment, and now influences how crops grow above it, revealing the old line in dry summers when moisture differences show up as contrasting bands of colour in a ripening field.

The enclosure at Rathclogh was first identified on aerial photographs taken in July 1964 and confirmed again in photographs from July 1969, both from the Cambridge University Collection of Aerial Photography. What makes the location especially arresting is not this single site in isolation but the cluster of similar enclosures surrounding it. At least five comparable cropmark features lie within roughly 100 metres in various directions, some as close as 15 metres away. This density suggests a landscape of considerable early activity, a place where people were establishing, defining, and perhaps repeatedly reoccupying bounded spaces over a long period. None of these enclosures announces itself above ground today; they exist only as traces read from altitude, with satellite imagery more recently confirming what the mid-twentieth-century photographs first caught.