The outline, roughly 72 metres across, is defined by a water-filled fosse, the term for a defensive or boundary ditch that often encircles early Irish enclosures, and it is cut through along a north-south axis by a natural watercourse. The whole thing reads, from the air, like a submerged ring drawn into the earth.

The feature was identified through Google Earth orthoimages, aerial photographs taken from directly overhead to minimise perspective distortion, and compiled by Caimin O'Brien based on details provided by Jean-Charles Caillère, with the record uploaded in April 2021. Certainty about its age remains elusive. The site sits on poorly drained grassland, the kind of low-lying ground that in Ireland has often preserved earthworks that drier conditions might have eroded or ploughed away. What makes researchers cautious about a firm attribution is that water-filled ditches and oval outlines can sometimes result from agricultural or drainage activity rather than ancient construction. That said, the oval morphology is characteristic of early medieval enclosures, the kind of circular or near-circular banked settlements found across Ireland from roughly the fifth to the twelfth centuries, and the proportions here are consistent with that tradition. The question of antiquity remains open.

Because the feature is most legible from above, Google Earth is genuinely the best starting point for anyone wanting to understand the shape of the place. On the ground, the poorly drained ground conditions mean the fosse retains water, which may give some visual indication of the outline in wetter months, though standing water and soft ground make close inspection difficult. The surrounding grassland offers little in the way of obvious surface remains. This is a site that rewards patience with aerial images more than a muddy walk around the perimeter, and its interest lies precisely in that ambiguity, a shape in the earth that may be very old, or may not be, and which the landscape has not yet decided to give up.