There is no visible mound, no marker, no obvious break in the landscape. What exists here is a ring-ditch, a circular trench roughly ten metres across, and it is entirely invisible to someone walking past. The only way to see it at all is from the air, where it shows up as a cropmark, the faint but legible trace left when buried archaeology causes crops or grass above it to grow differently from the surrounding soil. It is a ghost in the fields, readable only at the right altitude and the right time of year.

Ring-ditches of this kind are generally understood to be the remains of prehistoric burial monuments, specifically round barrows, where the central mound has long since been ploughed away or eroded, leaving only the encircling fosse, that is, the ditch that once defined the monument's edge. What makes Ballyda particularly interesting is that this ring-ditch does not stand alone. Several others have been identified in the same area, a cluster that points towards the existence of a barrow cemetery, a landscape deliberately chosen over generations, perhaps over centuries, as a place to bury the dead. The site was identified and reported by Jean-Charles Caillère, who spotted it through satellite imagery.