What is known about it comes entirely from the air, spotted as a cropmark or soil-mark during systematic aerial survey, a method that has quietly revealed more of Ireland's prehistoric landscape than decades of fieldwork on foot. The oval outline in a field at Milltown, in the barony of Coshma in County Limerick, exists on the record not because anyone excavated it or stumbled across visible earthworks, but because a photograph taken from above showed something that the grass and ploughed soil could not quite conceal.

The site was identified through the Bruff Survey and logged as Map 40, Bruff 128, aerial photograph reference AP 5/2070. Archaeologist Doody, writing in 2008, described it as an oval enclosure measuring approximately 45 metres by 30 metres, with what appears to be a possible internal bank. That internal bank detail is worth pausing on, because enclosures, which are broadly circular or oval areas defined by a bank and ditch, are among the most common monument types in the Irish landscape, and they were put to many different uses across many different periods. What makes this one of particular interest is its shape and overall morphology, which Doody suggested may point to a Bronze Age date, placing it somewhere in the broad span between roughly 2500 and 500 BC. Without excavation, that remains a working hypothesis rather than a confirmed date, but the form of an enclosure can sometimes act as a rough fingerprint when other evidence is absent.

Because the site was identified from aerial photography rather than as a visible surface feature, there may be little or nothing to see at ground level. Fields in this part of Limerick have been farmed continuously, and the earthworks, if they survive at all as physical features, are likely to be subtle at best. The surrounding barony of Coshma sits in low, fertile countryside south-east of Limerick city, and Milltown is a small townland in that quiet agricultural terrain. Anyone curious enough to visit should treat this less as a site to observe directly and more as an invitation to think about how much of Ireland's Bronze Age landscape lies just below the surface of ordinary-looking fields, visible only under the right light, in the right season, from the right altitude.