A low, grass-grown mound is the only surface trace of what was once a circular univallate enclosure, that is, a roughly circular area defined by a single earthen bank or wall, the kind of enclosure that appears across Ireland in great numbers and is most often associated with early medieval settlement. Until roughly the early 2000s, a small section of that original bank was still just about visible at ground level. Since then, even that fragment has gone.

The enclosure was recorded on the first edition of the Ordnance Survey map, which means it was substantial enough to be plotted by surveyors in the nineteenth century, when many such features were still legible in the landscape. Its documentation was later taken up by J. Cuppage as part of the Corca Dhuibhne archaeological survey of the Dingle Peninsula, published in 1986, a project that catalogued the remarkable density of early monuments across that part of Kerry. The Rathduff example, catalogued as no. 729 in that survey, sits within a broader landscape where enclosures, field systems, and other earthworks are not unusual. What is quietly striking here is precisely the speed of its disappearance, from a mappable monument to an almost imperceptible rise in a field within the span of recorded local memory.