It is not. The oval cairn at Poulaphuca measures roughly 8.4 metres north to south and 4.7 metres east to west, rising only about half a metre above the surrounding land. There is no visible kerb, no revetting stones to give away the deliberate hand behind it, just a gentle heap of large stones slowly disappearing beneath centuries of turf and grass.

What makes the site stranger than it first appears is the company it keeps. Some fifty metres to the south-east lies a second cairn, and eighty metres beyond that a wedge tomb, one of a type of prehistoric megalithic burial monument common across the west of Ireland, typically consisting of a roofed stone gallery that narrows or wedges toward its closed end. The three monuments together suggest this hillside was a meaningful place for communities over a long stretch of prehistoric time. The landscape carries further evidence of accumulated human activity: an older mound wall runs westward from close to the cairn for about a hundred metres, while later slab walls running north to south and east to west impose a more formal rectilinear pattern on the same ground. Together these form part of a multiperiod field system that spreads across the plateau to the west and into the neighbouring townlands of Cragballyconoal and Eanty More, each phase of boundary-making overlapping or cutting across the last. On a clear day, the cairn at Turlough Hill is visible some 6.5 kilometres to the north-north-east, a reminder that whoever placed this monument chose not just a practical edge of ground, but a position with sight lines that mattered.