Consisting of a fortified stonewall cutting off a triangular promontory. Protected by an elaborate system of earthen ramparts and trenches on the landward side. On the cliff edge inside the fort shows remains of stonewalling. The ruins of a circular building can be seen within the enclosure. The great wall 22 feet thick has an elaborate Souterrain [underground chamber] and a remarkable doorway. An inner ground tunnel, which at one stage leads to the hill above the tunnel, was said to be an escape route when invaded by enemies.