Positioned at the extreme southern end of the plateau on a promontory overlooking the slope below, it forms part of a much larger ancient field system that extends across the plateau as a whole. Cairns of this kind, modest mounds of piled stone, were laid down in prehistoric and early historic periods for purposes that varied considerably, from marking a boundary or cleared ground to memorialising the dead. This one measures approximately three metres in diameter, modest even by the standards of such monuments.

Keegan, writing in 2016, recorded the structure as part of a broader archaeological landscape, the field system covering the Termon plateau suggesting sustained human activity across the area over a long period. What gives the site an additional layer of interest is the presence of a second cairn roughly 65 metres to the southwest, further down the same slope. The two structures are close enough to suggest a relationship of some kind, whether sequential, functional, or simply the result of the same community working the same ground across generations, though the notes do not specify further. The plateau name, Termon, derives from the Irish tearmann, a word referring to sanctuary land associated with an early church or monastery, which adds a faint ecclesiastical shadow to what is otherwise a prehistoric-feeling place.