The rath at Knocknaman in County Kerry does the opposite. Set in pasture on a south-facing slope, it survives now only as a faint circular smudge in the landscape, a ghostly ring roughly 55 metres across, its earthen bank barely a tenth of a metre high and in places no more than intermittent. It is the kind of feature that a grazing animal would walk across without noticing.

A rath is an early medieval ringfort, typically a circular enclosure defined by one or more earthen banks and ditches, used as a farmstead and enclosure for livestock. The Knocknaman example was, according to local memory, deliberately levelled at some point, an act of agricultural clearance that was common enough across Ireland as land was brought more fully into tillage or improved pasture. What makes the site quietly interesting is the record of its gradual disappearance across successive Ordnance Survey maps. The 1846 six-inch survey recorded it as a circular enclosure of around 35 metres in diameter. By the 1895 edition, it appeared as a roughly circular raised area of around 45 metres, with an external fosse, a ditch running around the outside, visible from the north to the south-east. By the time ground survey was carried out more recently, the visible diameter had grown to 55 metres, a counter-intuitive expansion that likely reflects the spreading and flattening of the bank material over time rather than any growth of the monument itself. Each successive measurement captures a site in the process of being erased, and the comparison across those three moments gives a rare kind of slow-motion record of how a ringfort disappears into a field.