Carrowmore is not a single monument but a sprawling prehistoric cemetery, and the passage tomb at its centre is among the most ancient of the group. Passage tombs are a specific architectural form: a burial chamber reached by a narrow stone-lined corridor, the whole structure typically covered by a circular mound of earth or stones. What makes Carrowmore unusual is the sheer density of monuments across a relatively small area, and the way they seem to have been arranged in deliberate relationship with one another and with the broader landscape.

The primary scholarly account of this site comes from Seán Ó Nualláin, whose systematic survey of the megalithic tombs of County Sligo, published in 1989, documented the Carrowmore complex in careful detail. The tombs here are Neolithic in origin, belonging to a tradition of communal burial that flourished in Ireland roughly five to six thousand years ago. The cemetery as a whole has attracted attention since at least the nineteenth century, though many of its monuments were damaged or destroyed before formal archaeological interest took hold. The surviving passage tomb, designated a National Monument in State care, represents what remains of a tradition that once involved dozens of related structures across this part of County Sligo. Dominating the wider landscape is Knocknarea, the flat-topped hill to the west, crowned by the great unexcavated cairn known as Miosgán Médhbh, which forms a visual focal point that prehistorians believe was intentional rather than incidental.