It survives only as a ghost in a single aerial photograph, taken in 1965, where the buried remains revealed themselves through differential crop growth above the disturbed soil. That photograph, catalogued under reference BKS 70998, is now the sole witness to what was once a ring-ditch on low-lying ground at Tonlegee, in the old barony of Coolock.

A ring-ditch is, in its simplest form, a circular or roughly circular ditch cut into the ground, often the surviving trace of a prehistoric burial monument whose central mound has long since been ploughed or eroded away. They are frequently associated with Bronze Age funerary activity, though the term describes the form rather than the function, and individual examples vary considerably in date and purpose. What makes the Tonlegee example particularly poignant is the precision with which its moment of near-disappearance was captured. By 1965, the feature was already levelled, meaning nothing projected above the ground surface, yet the cropmark betrayed its outline to the camera. The record was compiled by Geraldine Stout, whose systematic work on Dublin's archaeological landscape has preserved notice of dozens of such sites that would otherwise pass entirely unremembered.

There is nothing to see at Tonlegee today. The housing estate that occupies the site has buried any remaining trace beneath foundations, tarmac, and garden soil. For anyone curious enough to look, the location sits in the general area of Tonlegee Road in Coolock, close to the Ward River corridor, but no marker, plaque, or visible earthwork acknowledges what lies below. The value of visiting, if visiting can even be the right word, is entirely conceptual: to stand on ordinary suburban ground and know that the landscape underfoot was shaped, and used, and mourned over, long before the city reached it. The 1965 aerial photograph remains the closest anyone can get to the ring-ditch now.