This one, sitting in rough pasture roughly 208 metres west of the townland of Ballygreenan in County Limerick, was not considered significant enough to mark on Ordnance Survey Ireland historic maps. It exists, in the official record at least, as a probable site rather than a confirmed one, which gives it a particular kind of quiet ambiguity. What is certain is that it does not stand alone: two companion barrows lie close by, with the nearest just 10 metres to the east, forming a small cluster that hints at a deliberate, patterned use of this piece of ground by people who left almost no other trace.

The site came to light not through excavation or field survey but through an aerial photograph taken on 3 November 1984, during examination of images commissioned for the Bórd Gáis Éireann Curraleigh to Limerick gas pipeline project. Aerial photography has long been one of archaeology's more productive tools, revealing features invisible at ground level by capturing the way buried earthworks affect crop and grass growth above them. These variations in vegetation, known as cropmarks, appear as faint tonal differences when photographed from above, particularly in dry summers when the soil moisture contrast is sharpest. The circular-shaped earthwork at Ballinlee showed up in exactly this way, and was subsequently confirmed as a cropmark on Ordnance Survey Ireland orthophotos taken between 2005 and 2012, and again on Google Earth imagery. The site was compiled into the record by Fiona Rooney and uploaded in April 2021.

Because the barrow sits in rough working pasture and carries no ground-level monument, a visitor walking the land would be unlikely to recognise anything underfoot. The circular form is simply not legible from the ground. The most practical way to appreciate what is there is to consult the Google Earth imagery online, where the cropmark remains faintly discernible depending on the season and conditions of the image captured. The surrounding area near Ballygreenan is otherwise unremarkable farmland, and the cluster of three barrows registered under the reference LI039-044002 represents one of those cases where the archaeological significance of a landscape is almost entirely invisible without the aid of a camera pointing downward from several hundred feet.