A ring wall runs around the islet, with a two-room blockhouse forming the defense opposite the causeway. The ring wall seems to have been built separately from the main structure. The blockhouse forms part of the ringwork, but is not bonded into the ring wall. The weaknesses in the defense of this and related structures could be explained by additional defenses of wood and thorn branches that have disappeared without leaving any trace. Another possibility is that the defenses were mainly symbolic, and perhaps played a part in warfare that was conducted according to formal rituals.
