The example at Ardnacrany sits on a slight natural rise, and its circular outline, roughly 26 metres across on its northeast to southwest axis, is still readable in the landscape despite centuries of weathering and agricultural interference.

The monument belongs to the category of earthwork known as a rath, the most common type of early medieval settlement in Ireland. A rath is essentially a circular enclosure defined by one or more earthen banks and a ditch, or fosse, dug just outside the bank. Farmers and their families lived within these enclosures, and the earthworks served as both a boundary and a degree of protection for livestock. At Ardnacrany, the enclosing bank and its external fosse survive, though both carry several disturbance gaps where the earthwork has been broken or degraded over time. Within 180 metres to the east-southeast lies a second ringfort, and a third sits 150 metres to the southwest, making this a remarkably concentrated grouping. Such clusters are not unknown in the Irish midlands, and they may reflect a community or extended family farming the same territory across generations, each household maintaining its own enclosed farmstead in close proximity to its neighbours.

The site itself is unobtrusive. There is no dramatic silhouette or towering bank, just a softly raised circle of ground set among undulating fields. Knowing what to look for, the slight swell of the earthwork and the faint depression of the fosse become legible once you are close enough to read the ground rather than the horizon.