The circle at Banagher, in County Cavan, is a substantial prehistoric monument, twelve stones arranged across an interior space measuring forty metres east to west and thirty-five metres north to south. Only five of those stones still stand upright, reaching between 0.65 and 1.3 metres in height, while the remainder lie prostrate on the ground, toppled at some point across the millennia. What makes the site particularly unusual is not just its scale but what sits at its centre: a ruined chambered cairn enclosing what may have been a passage tomb, a type of Neolithic burial structure in which a stone-lined corridor leads to a central chamber, typically covered by a large mound of earth or rubble.

The Banagher circle is not an isolated curiosity. It forms part of a wider complex of ritual sites in the same area, a clustering of monuments that suggests this landscape held sustained ceremonial significance for its prehistoric communities over a long period. Seán Ó Nualláin, whose 1989 study of Irish stone circles remains a key reference, noted the site in his survey work. The combination of a stone circle enclosing a megalithic tomb is not without parallel in Ireland, but it is far from common, and the scale of this particular example sets it apart from the smaller, less elaborate rings found elsewhere in Cavan and the surrounding counties. The preservation order placed on the monument reflects that recognised significance.