The enclosure at Pollronahan More is a rath, the Irish term for a ringfort, a type of circular earthen enclosure built throughout early medieval Ireland, most commonly between roughly 500 and 1000 AD, and typically associated with a single farmstead and its household. This one sits on a gentle northeast-facing slope, and the views it commands across the Glore River valley to the north and east give a clear sense of why the ridge was chosen.

The earthwork itself is almost perfectly circular, measuring 41 metres across in both directions. The defining feature is an earthen scarp, essentially a raised bank or edge of compacted soil, which varies noticeably in height as it runs around the perimeter. At the northeast arc it reaches 1.8 metres, built up deliberately to compensate for the natural fall of the slope, giving the enclosure a level interior despite the gradient beneath it. Towards the south and west, the scarp has weathered and collapsed considerably, leaving those sections low and broken. A narrow internal lip runs along part of the inner edge, which may indicate that the bank was later incorporated into a field boundary, its original form partially obscured in the process. Inside, near the northern half of the interior, there is a smaller semicircular feature, roughly five and a half to six metres across, whose purpose remains uncertain. A few stones protrude from its edge, but whether it represents a structure, a later addition, or something coinciding with the natural contour of the ground is not yet resolved.

The interior is now grazed pasture, its surface uneven and marked by cattle, and a road runs close to the southwestern edge. A second rath lies just 140 metres to the northwest, a reminder that these enclosures were rarely entirely isolated features; they clustered in landscapes that were already organised, farmed, and inhabited.