In flat pastureland near Moneen in County Galway, a prehistoric funerary mound was recorded on the first Ordnance Survey six-inch map of 1838 as a subcircular enclosure, measuring roughly 26 metres northwest to southeast and 22 metres northeast to southwest. By the time surveyors returned between 1912 and 1916 to produce the more detailed 1:2500 plan, the feature had resolved into something more precise: a small mound of about six metres in diameter, ringed by a fosse, which is a shallow encircling ditch that is a defining characteristic of the ring-barrow form. Today, no visible trace of any of this remains at ground level.

A ring-barrow is a low earthen mound, typically covering a burial, enclosed within one or more circular ditches. They are associated broadly with the Bronze Age, though the form persisted across several periods of Irish prehistory. The Moneen example was never excavated, and the classification in the cartographic record remains tentative, noted only as "possibly a ring-barrow." What the two maps together suggest is a monument that was already diminished by the late nineteenth century and had effectively vanished into the agricultural landscape within a generation or two after that. The progression from a 26-metre enclosure to a 6-metre mound across the span of those two surveys may reflect the effects of continued ploughing and land improvement, or simply a difference in how each survey team interpreted what they found.