Somewhere in the parish of Rathfaddan in County Waterford, there is a feature on the historical map that no longer has any presence in the landscape. A circular mound or enclosure, recorded at roughly twenty metres in diameter, was clearly visible enough to the Ordnance Survey cartographers of 1840 to be marked on their six-inch map. Today, standing at the same spot, you would see nothing. The site sits towards the top of a south-facing slope, an area that was once rough pasture, and is now given over to gardens.

The 1840 Ordnance Survey six-inch series was among the most detailed cartographic undertakings of its era in Ireland, and features recorded on it, particularly earthworks and enclosures, were often far older than the map itself. Circular enclosures of this kind are frequently associated with early medieval settlement, ritual use, or burial, though without excavation it is impossible to say which applies here. What the map captured, and what has since vanished, was a mound approximately the width of a modest house from edge to edge. Whether it was levelled deliberately, eroded gradually, or simply absorbed into successive changes in land use, the record does not say. The conversion of the surrounding rough pasture into cultivated garden ground is the most likely explanation for why no surface trace survives.