Two-thirds of the enclosure have been levelled, yet the site's name, Lisduff, meaning roughly "black fort" or "dark enclosure" in Irish, has persisted on Ordnance Survey maps since at least 1838, where it was recorded as a circular enclosure with trees planted inside.

The earthwork is classified as a possible rath, a type of enclosed farmstead typical of early medieval Ireland, usually consisting of a raised circular bank and ditch surrounding a domestic area. At Lisduff, the original enclosure measured approximately 27 metres on its northeast to southwest axis and around 28 metres across on the northwest to southeast. The western arc of the enclosing bank is the best-preserved section, surviving as a slumped earthen scarp between 3.3 and 5 metres wide and roughly 1.6 metres in external height, its crest strewn with stones and largely buried in overgrowth. Running just outside this western bank, and following the same curve, are the tumbled remains of a stone-built field wall, which may represent a later reuse of the boundary. Elsewhere, particularly along the northern and southern edges, the bank has been ploughed or grazed away, though its former line can still be read as a gentle undulation in the ground surface, especially where it coincides with the natural contours of the ridge.

The site does not sit in isolation. A further possible rath lies around 150 metres to the northwest, and another enclosure of uncertain character sits approximately 135 metres to the south-southwest, suggesting this small ridge was a focus of early settlement activity rather than a solitary feature in the landscape. The 1922 Ordnance Survey map shows the enclosure still legible and tree-planted at that relatively recent date, which makes the subsequent loss of its eastern portion all the more striking as a reminder of how quickly earthworks can disappear once agricultural improvement takes hold.