It exists, for now, primarily as a cropmark, a ghostly circle roughly thirty metres in diameter that only becomes legible from the air, appearing on photographs taken as part of the Bruff Aerial Survey. On the ground, the reclaimed grassland here is poorly drained and gives little away. The enclosure sits somewhere beneath ordinary pasture, its outline pressed into the soil as a subtle difference in crop growth or ground moisture, the kind of trace that aerial photography was specifically developed to detect.

A cropmark of this kind typically forms when buried ditches or banks influence how vegetation above them grows, with deeper, damper soil over filled-in ditches encouraging lusher, taller growth in dry summers. The enclosure at Doonvullen Upper belongs to a notably dense local cluster: three further enclosures recorded under the references LI023-177, LI023-252, and LI023-254 lie fifty to one hundred metres to the north, suggesting this corner of County Limerick was once a fairly busy patch of early settlement activity. The record was compiled by archaeologists Caimin O'Brien and Edmond O'Donovan and uploaded to the national archaeological inventory in September 2020.

The site sits in a landscape shaped by small but meaningful boundaries. A stream immediately to the east marks the townland boundary with Caherline, while a field fence seventy metres to the north separates Doonvullen Upper from Doonvullen Lower. These divisions are modern administrative survivals, but they follow ground that has been organised and reorganised by human activity for a very long time. For anyone curious enough to visit, access would need to be arranged with the landowner, and there is genuinely little to see at ground level. The value here is in the aerial image, which is the document that brought the enclosure into the record at all, and in the knowledge that the field underfoot contains considerably more than it appears to.