Diarmuid and Gráinne, fugitives from the wrath of the ageing hero Fionn Mac Cumhaill, are said in the medieval tale to have fled across Ireland, sleeping in a different place each night. Across the country, dozens of megalithic monuments bear their name, a folk tradition that attached the legend of perpetual flight to ancient stones that seemed, to later generations, too massive for ordinary human hands. The Clare example is among the more precisely documented of these: it appears labelled on both the 1842 and 1920 editions of the Ordnance Survey six-inch map, suggesting the name was well established in local memory long before antiquarians began visiting.

A wedge tomb is a type of Neolithic megalithic monument common in the west of Ireland, characterised by a gallery that is wider and taller at its western, entrance-facing end and tapers towards the east. This one fits the type closely. Described in detail by Ruaidhrí de Valera and Seán Ó Nualláin in their 1961 Survey of the Megalithic Tombs of Ireland, the chamber measures roughly 4.5 metres in length, narrowing from about 2.1 metres wide at the west to 1.1 metres at the east, and is formed by two massive limestone slabs set on their long edges. The southern sidestone, over five metres long and largely intact, has a hammer-dressed top edge and a small hole pierced through it, noted by the antiquary Thomas Johnson Westropp when he visited in 1913. The capstone, an enormous slab measuring 5.5 metres long and nearly three metres wide at its broader end, is broken in two, with a section missing at the central fracture, though it still rests on the sidestones. The whole structure sits within an elongated oval mound, and outer walling survives on both the north and south sides, along with what appears to be frontal outer-walling outside the western entrance. Two further wedge tombs lie within roughly thirty metres of this one, to the north and north-east, making this corner of County Clare unusually dense with prehistoric funerary monuments.

The tomb sits within a multiperiod field system and a field wall running north to south actually crosses the eastern end of the chamber, a detail that quietly speaks to centuries of agricultural activity layering itself around, and eventually into, a structure already thousands of years old. An inspection carried out in 1997 found it unaltered from the condition recorded in 1961, its limestone slabs still holding their positions in the clearing, open to wide views southward and westward across the Clare landscape.