A rath, as this type of monument is known, is a roughly circular enclosure defined by an earthen bank and outer ditch, built during the early medieval period as a farmstead or high-status dwelling. At Liscullane, only an arc of that enclosure remains, curving roughly nineteen metres from south-southeast to northwest, with the interior bank still standing to a height of around 1.6 metres. The outer ditch, or fosse, is shallow and only partially visible on the western side, though the line of it continues as a feature in the field to the east of the arc, suggesting the original circuit was considerably larger.

The site sits on a north-northwest-facing slope, now in pasture, and by the time the Ordnance Survey produced its six-inch map in 1842, the remains had already been absorbed into the local field fence system, the earthwork repurposed as a convenient boundary rather than preserved as a monument. That map depicts it as a hachured kidney-shaped area, roughly thirty metres on its longer northwest-to-southeast axis and around ten metres across, which gives a sense of the original scale even where the bank itself has been reduced or lost. A horseshoe-shaped depression in the western half of the interior may point to quarrying at some point, perhaps by the same farming community that folded the bank into their field boundaries, making practical use of what was already there.