A circular form, roughly 33 metres in diameter, shows up as a cropmark in satellite imagery, its curved outline tracing the ghost of a structure that no longer has any obvious presence at ground level. Cropmarks form when buried features, old ditches, walls, or pits, affect how overlying crops or grasses grow, leaving faint but legible patterns that only become visible from altitude, particularly during dry spells when differential moisture retention in the soil becomes pronounced. Here in the townland of Oolahills East, that aerial signature is a curvilinear earthwork, most likely the remains of a ringfort or enclosure, though its precise nature and date have not been established.

What makes this particular example a little more complicated is the way a field boundary cuts across its western arc. That boundary, which also marks the townland limit between Oolahills East and the neighbouring townland of Moanroe, appears to have been laid down without any regard for the older form beneath it, slicing through the enclosure and leaving its western edge incomplete. The record was compiled by Caimin O'Brien, drawing on details provided by Jean-Charles Caillère, and uploaded in November 2021. The primary evidence comes from Google Earth orthoimages, meaning this is an archaeology of inference rather than excavation, its existence confirmed by the landscape itself rather than by any dig.

Because this site exists essentially as a cropmark, there is little to see on the ground in the conventional sense. A visit to the area during or just after a dry summer period, when crop stress reveals buried features most clearly, would at least give some context for how such marks appear and disappear depending on the season and the state of the land. The townland boundary that bisects the enclosure can itself be traced in the field pattern, and that layering, a modern administrative line running through an ancient circular form, is in some ways the most legible thing about the place. Access would depend on landowner permission, and anyone hoping to locate the site precisely would need to cross-reference the available satellite imagery carefully, since there is no marker, signage, or visible surface feature to guide a visitor.