Wedge tombs are the most numerous of Ireland's megalithic tomb types, built during the late Neolithic and into the Bronze Age, roughly between 2500 and 2000 BC. They take their name from their shape: a roofed stone gallery that tapers in both height and width from front to back, typically oriented towards the west or south-west, possibly in alignment with the setting sun. Most are found in the west of Ireland, concentrated in counties Clare, Mayo, and Galway, often on upland ground that was more accessible to early farming communities than the heavily wooded lowlands below.

Béal Deirg Mór itself is a small rural townland, and the tomb there has not yet been brought fully into the documented record accessible to the general public. What can be said is that its existence places this quiet corner of Mayo within a much older geography, one mapped not by roads or parishes but by the burial and ceremonial sites of communities who worked this land thousands of years before the current field boundaries were drawn. Wedge tombs in Mayo are rarely elaborate; many survive as little more than a collapsed arrangement of large stones, their capstones tilted or fallen, their chambers open to the sky. That plainness can make them easy to overlook, which is part of what makes them worth seeking out.