In a Google Earth orthoimage captured on 14 September 2019, a roughly circular cropmark appears in reclaimed pasture in the townland of Ballygrennan, the kind of faint signature that marks where a ringfort once shaped the land. Ringforts, also known as raths, were enclosed farmsteads typically surrounded by one or more earthen banks and ditches, and they were built in their thousands across Ireland during the early medieval period. Most were home to a single farming family. This one has left little above ground, but the soil remembers it.

The site sits immediately south of a watercourse that forms the townland boundary with Baunnageeragh, a position that would have made practical sense for early settlers who valued proximity to fresh water. The Ordnance Survey Ireland 25-inch map records it as a circular platform roughly 20 metres in diameter, defined by a scarp, which is a low slope or edge where the ground level changes, suggesting the raised interior of the original enclosure has partially survived beneath the pasture. A further possible ringfort site, recorded under the reference LI040-089, lies immediately to the west, hinting that this corner of County Limerick may once have supported a small cluster of early medieval settlement. The record was compiled by Martin Fitzpatrick and uploaded to the Sites and Monuments Record in June 2021.

The cropmark itself is only visible from the air, emerging when differential crop growth or soil moisture betrays the outline of buried features beneath. On the ground, the scarp noted on the historic map is the most a visitor might hope to detect, and only then with some patience and a good sense of the terrain. The site lies in working agricultural land, so access would require landowner permission. For those who prefer their archaeology at a remove, the Google Earth orthoimage offers a surprisingly legible view of what centuries of farming have otherwise done their best to erase.