It measures thirty-three metres in diameter, which puts it well within the range of the thousands of ringforts scattered across Ireland, yet what makes this one quietly interesting is how thoroughly time has worked to erase it. The earthwork survives only in fragments, a barely perceptible swelling of soil here, a shallow depression there, and across a significant portion of its southern arc the defining bank has vanished almost entirely, leaving only a broad, gently sloping scarp to suggest where it once stood.

Ringforts, known in Irish as raths when defined primarily by earthen banks, were the most common form of enclosed settlement in early medieval Ireland, generally dated to the period between roughly the fifth and twelfth centuries. They typically served as farmsteads for a single family or household, the enclosing bank and its accompanying fosse, a shallow external ditch, providing a degree of protection for livestock and a marker of social territory as much as a defensive barrier. At Lisduff, the fosse survives to a width of around 3.8 metres and a depth of 0.4 metres, most legibly along the eastern and south-southeastern arc of the site. The bank itself, where it can still be read, reaches an internal height of about 0.8 metres and a width of 3.6 metres, modest dimensions that suggest a relatively modest enclosure. No original entrance can be identified in what remains.