The site at Lismoyle is a poorly preserved circular enclosure, roughly 35 metres in diameter, and what makes it quietly interesting is precisely how little of it remains legible. A bank survives along part of the circuit, a scarp takes over for another stretch, and along a significant portion from north to south-east, there is nothing visible at all at ground level.

The cartographic evidence points to this having been a rath, the most common type of early medieval settlement in Ireland. A rath was typically a circular area enclosed by one or more earthen banks and ditches, used as a farmstead by a family of some local standing, probably between roughly the sixth and twelfth centuries. At Lismoyle, the enclosing element has been further obscured by a field boundary that cuts across it from the south-south-east through south to north-west, a reminder of how thoroughly later agricultural organisation can overwrite earlier landscape features. The gentle north-facing slope on which it sits is unremarkable farmland today, which is part of what makes the survival of even these fragmentary traces worth noting.