It is a boulder-burial, a type of prehistoric monument in which a substantial cover-stone, supported by smaller stones beneath it, is set over or into the ground, often within a low surrounding mound. The cover-stone here is quartz, roughly 1.4 metres square and 0.8 metres thick, and two support stones are visible underneath it. A grass-covered mound, about 4.2 metres in diameter and only 0.15 metres high, encircles the whole arrangement. The slope faces south-east, overlooking the Coomnageragh river, and on a clear day the positioning feels deliberate in a way that is hard to articulate but easy to sense.

Boulder-burials are found mainly in the south-west of Ireland and are generally associated with the Bronze Age, though the precise ritual function of any individual example is rarely certain. What makes the Cullomane site particularly interesting is its relationship to the surrounding landscape. Approximately 200 metres to the east lies a five-stone circle, a compact stone circle type characteristic of Cork and Kerry, with five upright stones arranged in an oval. To the north-east, two standing stones and a cairn are recorded as having been used as penitential stations, meaning they were incorporated into later Christian devotional practice, a common pattern in Ireland whereby prehistoric monuments were absorbed into the rhythms of folk religion rather than abandoned or destroyed. This layering of use across millennia is not unusual, but having so many monument types clustered within a short walk of one another gives the hillside at Cullomane a particular density of presence.