What makes it quietly arresting is not its size but its ambiguity. The slabs, averaging about half a metre in height and a little over a metre wide at the base, define the enclosure from the north-west around to the south-east, while a low stony bank, only about 20 centimetres high, presses against them from outside at the north-west. Along the western side, a faint linear depression in the ground hints at where the boundary may once have continued.

Enclosures of this kind, typically circular or oval areas bounded by a bank, wall, or upright stones, are among the most common yet least understood monument types in the Irish landscape. They may be prehistoric or early medieval in date, and their original function, whether domestic, agricultural, or ritual, is rarely obvious from surface remains alone. At Bun an Doirín, one detail stands out: an upright slab at the eastern side, nearly a metre high and set at right angles to the main line of the enclosure, which may represent the remains of an entrance feature. The site sits just north of where the Cummeranearla stream meets the Inny, and was already noted on the first edition of the Ordnance Survey map, meaning it was sufficiently visible in the nineteenth century to catch a surveyor's attention. The enclosure was recorded in detail by A. O'Sullivan and J. Sheehan in their 1996 archaeological survey of the Iveragh Peninsula, published by Cork University Press.