This stronghold is situated in a wild romantic district among the mountains, to the north of the village of Drimoleague in the eastern division of West Carbery, about seven miles east of Bantry, County Cork.
Above it rises the hill of Mulraugh-Nesha. The country round is destitute of trees, and from its elevated position the castle is visible from a wide area.
The fortress consists of a tall, square keep with crenelated battlements and defences projecting from the angles. It is built on a rock, the rough surface of which forms the floor of the lower room in the castle.
There seems to have been no attempt to make the ground even, as great indentations, nearly two feet in depth, extend the whole length of the apartment.
The first floor is supported by a vault, and this state apartment measures about 26 feet by 20. The windows and loops are exceedingly small, the former being surrounded by label mouldings well cut in the dark freestone.
A spiral stair leads to the hall above the vault, and this is open to the heavens, but the high-pitched gables of the roof still remain. Great cracks in the masonry run down the centre and through the south-west angle.
It belongs to the earliest type of castle which succeeded the peel tower. The outworks, of which little remain but the foundations, are situated close to the keep.
The O’Donovans were descended from a long line of Munster kings. Cahill, the son of Donovan, was killed in 1254, and from him the district round the stronghold took its name, and also the clan of which he was chief.
It is likely that he erected the fortress.