A ploughed field in Co. Waterford is not the most obvious place to go looking for ancient earthworks, yet satellite imagery captured between 2011 and 2022 revealed something quietly persistent beneath the tillage at Mountaincastle: a roughly circular enclosure about 45 metres in diameter, its outline still legible as a low scarp along its western to north-north-eastern arc, and as a curving field boundary along the south-eastern to south-western edge. These kinds of enclosures, sometimes interpreted as ringforts, were typically built during the early medieval period as enclosed farmsteads, with the surrounding bank or scarp serving as a boundary against livestock straying and perhaps offering a degree of social definition as much as physical protection. What makes this one particularly interesting is how much of it has been absorbed into the working landscape without quite disappearing.

The site was identified and reported by Stuart Elder, whose observation draws attention to how much can still be read from aerial and satellite sources even where ground-level traces are faint. A field boundary running north-north-west to south-south-east along the eastern side appears to partially cut across and truncate that edge of the enclosure, suggesting the modern agricultural layout has progressively encroached on an older one. A trigonometric station at approximately 120 metres above sea level is marked on the southern perimeter, a detail that places the enclosure on elevated ground and hints at why it might have been a meaningful location in earlier centuries. Roughly 70 metres to the south-west lies a separate ringfort, already recorded in the archaeological register, which raises the possibility that this stretch of Waterford upland supported a cluster of early settlement activity rather than a single isolated farmstead.