Roughly circular, about twelve metres across and less than a metre high, it is the kind of feature that a passing walker might take for a trick of the ground. But the undulating surface of its interior, along with what appear to be grave markers, suggests something quite deliberate beneath the turf.

The place name Donaghmore derives from the Irish Domhnach Mór, meaning great church, a name type that across Ireland tends to signal early Christian ecclesiastical settlement, often of considerable age. Burial grounds associated with such sites were frequently in use for centuries, sometimes predating any standing church, and the raised, subcircular form here is characteristic of early medieval burial enclosures, where the accumulated burials of generations gradually lift the ground surface above its surroundings. The possible grave markers visible in the interior hint at a site that may once have been more legible, its edges and purposes clearer before time and grazing animals did their slow work.