This monument, officially designated as National Monument no. 139 (4), forms part of a remarkable concentration of seven megalithic tombs scattered across this landscape. Of the three portal tombs on the valley’s northern side, this westernmost example offers commanding views across the surrounding countryside.

The eastern structure consists of four massive stone slabs that have collapsed into one another over the millennia. The largest slab, measuring 3.8 metres by 1.85 metres and half a metre thick, likely served as the original roofstone before toppling southward. It now rests against what archaeologists believe was the chamber’s backstone; a 2.2 metre long slab that, if standing upright, would reach 2.1 metres in height. Two additional stones, possibly the portal stones that once flanked the chamber’s entrance, now lie prostrate with one overlapping the other. When intact, this chamber would have faced east, following the typical orientation of portal tombs in Ireland.

The western element presents more of a puzzle, consisting of just two leaning slabs whose tops meet whilst their bases remain 1.3 metres apart. The western stone, standing relatively upright at what would be 1.2 metres if vertical, displays a distinctive gabled outline suggesting it was deliberately positioned as a backstone. Its companion leans at a dramatic 45-degree angle and may have served as a roofstone. Historical accounts add intriguing details: Thomas Fagan noted in 1847 that both structures stood within a ‘paved causeway’, whilst Norman Moore observed a stone-studded ridge connecting the two elements in 1872, suggesting they may have once been united by a cairn that has since largely disappeared into the boggy ground.