The one at Coumaclavlig sits on a west-facing slope in the upper Barony River valley in County Cork, now enclosed within a coniferous forest planted in 1991. That planting is a small irony: a monument several thousand years old, of a type associated with the late Neolithic and early Bronze Age, quietly absorbed into a commercial forestry block within living memory. From somewhere among the trees, the land opens southward with views down the valley toward Glengarriff Harbour.

The tomb's gallery runs east to west and measures 3.7 metres in length by 0.8 metres wide, divided roughly in half by a transverse slab into two chambers of nearly equal size. The western chamber retains a roofstone measuring two metres by 1.2 metres, which still covers it almost completely; a second, slightly smaller roofstone lies in the eastern chamber. The eastern end has lost its northern side entirely, leaving only a backstone and a fragment of the southern walling. A few overlapping and fallen slabs to the south of the gallery may represent what was once outer-walling, a feature sometimes seen enclosing the cairn material that would originally have surrounded such a structure. About 1.2 metres in front of the western opening lies a near-recumbent slab that may once have served as a septal stone, a kind of threshold or internal divider. Four metres to the north of the tomb stands an upright stone, 1.85 metres long and 0.85 metres high; whether it belongs to the monument or is unrelated remains unclear. The site does not stand in isolation: an enclosure lies 62 metres to the north, pre-bog field walls survive 140 metres to the north-east, and two further wedge tombs are visible from the site, one roughly 900 metres to the north-east and another across the valley 1.3 kilometres to the north-west. The pre-bog walls are a reminder that this landscape, now forested and largely bare of settlement, was once sufficiently cleared and farmed to leave boundaries in the ground beneath the peat.