The larger of the two is an oval shape, roughly 40 metres along its northwest to southeast axis and about 31 metres across, its boundary defined by a fosse, a rock-cut or earthen ditch, that left no upstanding trace but impressed itself into the subsoil deeply enough to affect how crops grow above it. On a dry summer, the differential in soil moisture causes the vegetation to respond differently over the buried ditch, producing what archaeologists call a cropmark, a faint but telling discolouration that satellite cameras can resolve long after ploughing has erased everything visible at surface level.

The enclosure was identified and reported by Jean-Charles Caillère using Google Earth imagery dated 10 August 2022. Immediately to the west sits a smaller circular enclosure, a companion site that was apparently still visible as an earthwork until around 1970, when it too disappeared into the cultivated landscape. The relationship between the two is not fully resolved. The larger oval may have been built to adjoin the smaller circle, the two forming a conjoined complex of the kind occasionally found in Irish early medieval settlement archaeology, where a main enclosure and a subsidiary one shared a boundary or gateway. Alternatively, the oval may be the older of the two, predating its neighbour by a period that is, for now, impossible to determine without excavation.

Both sites remain under active tillage, with no physical presence to observe at ground level. Their existence depends entirely on the right atmospheric conditions, the right crop, and a camera overhead at the right moment in a dry August.