No signpost marks it, no fence sets it apart from the surrounding farmland, and yet the outline is clear enough to be picked up on satellite imagery: a penannular ring-ditch, roughly 12.9 metres in external diameter, its encircling ditch less than a metre wide but continuous enough to describe an almost unbroken arc, broken only at its north-western quadrant.

A ring-ditch, in broad terms, is the buried or crop-mark trace of a circular ditch, most often associated with Bronze Age funerary or ceremonial activity, though the term covers a range of features whose precise function can be difficult to establish without excavation. This particular example sits towards the south-eastern boundary of the field, about 153 metres west of the White Hart Inn, and forms part of a cluster of similar features recorded in the environs of Balrothery. The concentration of ring-ditches in this part of north Dublin suggests the area held some significance in prehistoric times, though the Stephenstown example has not, as far as the record indicates, been excavated. The site was compiled and recorded by Tom Condit, with notes uploaded in April 2021.

The ring-ditch is not accessible in any formal sense; it lies within agricultural land and is not presented as a visitor site. The most practical way to appreciate it is through Apple Maps satellite view, where it was clearly legible as of June 2018, the encircling ditch showing as a tonal contrast against the ploughed or growing crop. If you do find yourself on the road near Balrothery, the White Hart Inn serves as a useful locating marker, and the field boundary to its west is where the feature lies. Crop-mark sites like this tend to show most clearly from the air during dry summers, when differential soil moisture above a buried ditch causes the overlying vegetation to grow or colour differently from its surroundings, giving the circle its visibility from above even after centuries of ploughing have reduced it to almost nothing at ground level.