A ring barrow is a prehistoric burial monument, typically consisting of a central mound surrounded by a circular ditch and sometimes an outer bank, built to mark the remains of the dead. This one, roughly ten metres in diameter, exists now only as an aerial photograph can confirm it: a faint circular cropmark or soil-mark, read from above and invisible to anyone standing in the field itself.

Aerial photography has been one of the principal tools for locating buried archaeology across Ireland, particularly in low-lying ground where centuries of agricultural activity, drainage, and soil accumulation have levelled earthworks that were once clearly visible. The circular enclosure at Ballyholahan shows up on an aerial photograph designated OS 2430/1, its outline betrayed by the way vegetation or soil moisture responds differently over a buried ditch than over undisturbed ground. The monument beneath is likely prehistoric in origin, as ring barrows are generally associated with Bronze Age funerary practice, though without excavation the date and contents remain unknown. The surrounding wet pasture has probably contributed both to the monument's preservation underground and to its erasure above it.