The one at Harristown in County Wexford is less forthcoming. At ground level there is nothing obvious to see, yet from the air a ghostly circle betrays the outline of an enclosure roughly 30 metres across, visible only as a cropmark, the differential growth of crops over buried features beneath the soil drawing the shape of an ancient boundary that has otherwise vanished entirely.

Cropmarks of this kind form when buried ditches or banks influence how deeply rooted plants draw moisture and nutrients, causing growth patterns that, from sufficient height, resolve into recognisable shapes. In this case, the mark reveals a circular enclosure defined by a single fosse, which is the archaeological term for a ditch, with what appears to be an entrance gap on the southern side. The site sits on a slight north-south spur in the land, a modest elevation that would have been characteristic of how ringfort builders, likely farming families of the early medieval period, chose their ground. Thousands of such enclosures once organised the Irish countryside, each one typically the homestead of a single extended family, the fosse and any accompanying bank serving as a boundary and a modest defence against livestock theft or opportunistic raiding.