A cashel is a type of early medieval stone ringfort, typically enclosing domestic and agricultural buildings, and this one at Baile An Chnocáin is more densely furnished with internal structures than most. The souterrain, an artificially constructed underground chamber or passage often used for storage or refuge, is now inaccessible, its entrance marked only by a lintelled recess set into the base of a hut wall.

The most thoroughly recorded of the huts lies to the north-east of the cashel's centre and measures roughly 4.8 metres by 4.4 metres internally. Its walls survive to a height of 1.65 metres on the inside and 2.25 metres on the outside, though the upper sections show evidence of later rebuilding. A narrow lintelled entrance on the western side, less than 60 centimetres wide and just over 75 centimetres high above present ground level, is partly blocked by collapse. What makes this particular hut especially interesting is the detail of its interior fittings. Two wall-cupboards are stacked one above the other just south of the entrance, the lower lintel of the souterrain recess serving as the base of the first. A third wall-cupboard sits to the north of the entrance, small but precisely constructed: half a metre wide, 40 centimetres high, and 50 centimetres deep. These built-in niches speak to the practicality of whoever lived here, arranging storage into the very fabric of the walls. The site was surveyed and described by J. Cuppage in the 1986 Dingle Peninsula Archaeological Survey, published under the title Corca Dhuibhne by Oidhreacht Chorca Dhuibhne.