On the Curragh, the great open plain of County Kildare long associated with horse racing and military training, a burial monument lies invisible to anyone walking the ground. It survives not as a mound or earthwork but as a cropmark, a ghostly circular outline readable only from the air, where the buried remains of an ancient fosse cause the grass or grain above it to grow at a slightly different rate, betraying what lies beneath.

The site was identified from an aerial photograph, reference CUCAP BDU 21, which shows the cropmark of a roughly circular area with an estimated maximum diameter of around 13 metres. The outline is defined by a narrow fosse, which is simply a ditch dug as part of the original monument's construction, and there are faint suggestions of an outer bank beyond it. This combination, a central area enclosed by a ditch with a surrounding bank, is characteristic of a ring barrow, a class of later prehistoric funerary monument found across Ireland and Britain. Ring barrows are generally associated with the Bronze Age or Early Iron Age, though the date of any individual example can rarely be confirmed without excavation. At 13 metres across, this is a relatively modest example, and the fact that it leaves no surface trace on the Curragh today is not unusual; centuries of grazing and military use on the plain have flattened countless earthworks that once stood clear above the turf.