Sitting on a north-south ridge in reclaimed pasture at Altanelvick, this was once a cashel, a type of ringfort built from stone rather than earth and timber, typically used as a defended farmstead or high-status enclosure during the early medieval period. What made this particular example unusual was its complexity: beyond the central circular enclosure, two widely-spaced outer walls surrounded it, and the spaces between those walls were further divided by radial walls and more irregular internal subdivisions. That kind of layered, compartmentalised layout points to a site of some elaboration, perhaps one that served agricultural, residential, and defensive functions simultaneously.

The detail of those subdivisions was not recovered by excavation or ground survey but from aerial photography, specifically from images referenced as ACP V 203/148-9, Roll 25, prints 19 and 20, which captured the cropmark or earthwork patterns that the human eye at ground level would have struggled to read. By the time anyone thought to look closely at the site, much of the physical fabric had already gone. The cashel was levelled during the 1960s, a fate shared by many such monuments across Ireland during decades of agricultural improvement, when old earthworks were seen as obstacles rather than archives. What survives today is a slightly raised circular area approximately 29 metres in diameter, with faint remnants of the two outer walls still just identifiable within the pasture. It was never on the map, it was then erased from the ground, and yet the outline persists, a faint signature in a reclaimed field.