They show up only from above, and only under the right conditions, as faint cropmarks, the subtle discolouration that appears in dry summers when grass or grain grows differently over filled-in soil than over undisturbed earth. A ring-ditch is typically the last trace of a prehistoric funerary monument, the encircling fosse, or ditch, that once surrounded a burial mound after the mound itself eroded away over centuries. What makes this particular site quietly arresting is the arrangement: three of them, aligned on a north-south axis, spaced closely together in the same level ground.

The southernmost of the three measures approximately nine metres in diameter, with a second lying around 44 metres to the north and a third roughly 50 metres beyond that. The grouping was identified through aerial imagery captured in July 2018, the kind of oblique or satellite photography that has transformed the discovery of low-visibility archaeological features across Ireland in recent decades. Cropmark sites of this kind often escape notice for generations, leaving no upstanding remains and attracting no particular local tradition or folklore. The three ring-ditches at Ardoyne appear to be exactly that sort of quietly persistent presence, a small prehistoric cemetery that has been ploughed over, grazed over, and looked past for a very long time.