A ditch barrow is a funerary monument of prehistoric origin, typically consisting of a low earthen mound encircled by a surrounding ditch, the whole ensemble serving as a burial marker for individuals or communities whose names are long lost. These structures are less frequently discussed than their grander cousins, the passage tombs and wedge tombs that attract most of the attention in Irish prehistoric archaeology, yet they represent the same fundamental human impulse to mark the dead against the indifference of open ground.

Beyond its classification and its location in Castlereagh, the record for this particular monument is sparse. The site has been identified and catalogued as part of the broader effort to document prehistoric funerary remains across Mayo, a county with no shortage of them, but detailed information about its dimensions, condition, or excavation history has not yet been made publicly available. What can be said is that ditch barrows in Ireland generally date to the Bronze Age, roughly 2500 to 500 BC, a period when individual burial under earthen mounds became increasingly common across the island, replacing the communal tomb traditions of the Neolithic.