It measures roughly 35 metres east to west and rises about 4 metres, with its top platform spanning perhaps 15 metres at its widest. There are no grave-markers. There is no inscription. What it almost certainly once was, however, is a burial ground whose stones were carried off to build a cabin wall.

Writing in 1802, Walter Tighe recorded the place by its Irish name, Reighlig na lughduigh, meaning the burying place of the black lough, and situated it in the parish of Macullee, south-east of Purcell's Hill. A reighlig is a traditional burial enclosure, sometimes pre-Christian in origin, and Tighe described around twenty small upright stones arranged at the heads and feet of bodies. A Mr Ellis, excavating between them, found decayed bones close to the surface. A faint local tradition held that a battle had been fought there, which might account for the number of graves. By the time Tighe was writing, most of the stones had already been removed to build a nearby cabin. On the summit above the burial ground stood a small circular enclosure on a hill called Knock-major, named after a local landowner, Major Purcell. The Ordnance Survey's first edition map of 1839 shows an oval mound straddling a townland boundary here; by the 1899 revision, the western portion had disappeared entirely, presumably levelled, leaving only the eastern section within Coolraheen South townland. That eastern remnant, partly quarried into at its north-east corner, is what survives today.

The mound is almost certainly the site Tighe was describing, though the connection cannot be confirmed with certainty. What makes Coolraheen quietly unsettling is the layered erasure: the grave-markers taken for building stone, the western half of the mound levelled between two surveys, the bones found just below the surface and then left again. Even the battle tradition has grown faint. What remains is a grassy platform in a field, with nothing on it to explain itself.