At Ballybetagh, in the Dublin uplands near the Glencullen River Valley, there is nothing left to see of what was once a substantial cairn, a mound of heaped stones roughly twelve metres in diameter. It was not lost to centuries of weathering or the slow creep of vegetation. It was simply removed, sometime during the 1960s, and the land it occupied has since been absorbed into reclaimed pasture that slopes south-eastward toward the river valley below.

Cairns of this kind are among the more ancient features of the Irish landscape, typically associated with prehistoric burial or territorial marking, though without excavation records it is difficult to say precisely what purpose this one served or how old it was. What is recorded, in a survey compiled by Geraldine Stout and Padraig Clancy and drawing on fieldwork by Healy from 1975, is the basic fact of its existence and its dimensions, and the bald note that no visible remains survive. The twelve-metre spread suggests something considerable, not a casual field clearance pile but a deliberate construction, and its position on ground falling toward a river valley would have been a recognisable landmark in the wider terrain.

There is, practically speaking, nothing to find here in the conventional sense. The site sits on what is now agricultural land, and any visitor making their way to Ballybetagh on the southern fringes of County Dublin would be looking at ordinary pasture. The value of coming, if there is one, lies in the exercise of reading absence, of standing on ground where something twelve metres across once rose above the surrounding fields and is now entirely gone. The Glencullen Valley itself offers enough to orientate yourself in the landscape, and the broader area carries other traces of earlier occupation. But this particular spot asks the visitor to take the archive's word for it.