Surveyors noted its presence but recorded that access was not gained, leaving it in a curious state of documented obscurity, known but unverified on the ground.

A rath, as ringforts of this type are commonly called, is an enclosed farmstead of the early medieval period, typically circular and defined by one or more earthen banks and ditches. They were the homes of farming families across Ireland for roughly a thousand years, and Kerry has more of them than almost anywhere else. The Knockreagh example shows up on the Ordnance Survey six-inch map of 1895 as a circular enclosure with a diameter of approximately 35 metres, skirted by a lane running roughly west-south-west to north-north-east. That lane, and the enclosure it wraps around, are the only details the historical record preserves. Whether the earthworks survive intact beneath the forestry canopy, or have been degraded by planting and drainage work over the intervening century, is simply not known.