Ringforts, known variously as raths or lisses, were enclosed farmsteads typically dating from roughly the fifth to the twelfth centuries, defined by one or more earthen banks and ditches that protected a household and its livestock. This one, sitting just north of the townland boundary with Cloonbrien, has been worn down considerably, yet enough survives to trace the logic of the original structure.

When the Ordnance Survey mapped County Limerick in 1840, their field notes described Lisheengorm as one of ten ancient forts near the south-western boundary of Rathcannon townland, a cluster that speaks to how densely settled this landscape once was. The 1840 six-inch map shows a sub-circular raised platform defined by a scarp, the edge where the raised interior meets the surrounding ground. By the time the more detailed 25-inch edition was published in 1897, the monument had been partially levelled, though surveyors could still trace a roughly circular area of approximately 26 metres in diameter, with a fosse, that is a defensive ditch, visible across much of the northern and eastern arc, and a bank surviving along the north-western side. At some point after 1700, a field boundary cut across the south-eastern edge, and the townland boundary itself clips the southern end, both intrusions slowly reshaping what had already been a declining earthwork.

The fort lies in pasture and is described as scrub-covered in recent satellite imagery from September 2020, which means the vegetation itself has become part of what preserves it, as farmers tend to leave such humps and hollows alone rather than plough through them. A second enclosure sits approximately 220 metres to the east, so the immediate area rewards a careful look at the broader field pattern. The site does not announce itself, and there is no formal access or signage, so the experience is one of reading the landscape rather than consulting an information board. The clearest impression of the monument's shape comes from observing where the ground rises and where scrub gathers, particularly along the northern and western arcs where the bank and ditch are most intact.