Megalithic tombs, built during the Neolithic period roughly five thousand or more years ago, were communal monuments, places for the dead and perhaps for ritual, constructed from large stones arranged into chambers and often covered originally by a cairn of smaller stones or earth. Mayo has a notable concentration of such structures, from the grand court tombs of the north to portal tombs and passage tombs scattered across the county's bogs and hillsides, and Corlee's example belongs to this broader tradition of stone-built memory in the west of Ireland.

Beyond its location and its classification as a megalithic tomb, the specific details of this particular monument, its dimensions, its type, its condition, and any history of excavation or local association, remain difficult to pin down from currently available sources. That obscurity is itself a kind of fact. Many of Mayo's ancient monuments were recorded in field surveys but have received little subsequent scholarly attention, and some remain known mainly to local farmers and walkers rather than to any wider audience. The western landscape has a way of absorbing these structures, the stones greening over with moss, the outlines softening into the surrounding terrain until a monument that once commanded a hillside becomes simply part of it.