What gives the site an added layer of strangeness is its neighbour: immediately to the south-east, a large swallow hole, roughly 50 metres by 20 metres and several metres deep, swallows the ground entirely and disappears into dense overgrowth. On the 1922 Ordnance Survey six-inch map, this void carries the name Polldotia, a name that has quietly persisted while everything around it changed.

The mound itself is a prehistoric burial monument, a type known as a mound barrow, constructed from earth and stone and measuring roughly 11.5 to 12 metres in diameter, rising to about 1.85 metres at its northern side. Such barrows were raised over the dead during the Bronze Age and sometimes earlier, serving as markers in the landscape as much as places of internment. What is particularly telling at this site is the way the later landscape has accommodated it: both a field wall to the west and a modern road to the north curve around the mound rather than cutting through it, suggesting a long, quiet recognition of the monument's presence even after its original meaning had faded. To the south and north-east, within a range of roughly 100 to 400 metres, lie several further monuments, including ringbarrows, possible cairns, and a possible ringcairn, a circular arrangement of stones with a cleared interior. Taken together, they suggest this low rise above the Deel was once a place of some ceremonial or funerary significance. All of this sits below the long profile of Nephin Mountain to the south-south-west, with the Nephin Beg Range filling the western skyline.