The main wall consists of a core of masonry 2·60 metres thick, rising about 10 metres above the present level of the ground (section _e-f_, Plate 5, Fig. 1). It is difficult to get absolutely accurate measurements of height as the surface-level varies slightly according to the depth of ruin strewn over it. Blind arcades on the interior and on the exterior carry the chemin de ronde. On the interior, pilasters 1 metre deep are united by arches very slightly pointed (Plate 7, Fig. 1). The pilasters are without capital or impost, the arches springing directly from them. The arches rise to a height of 8·50 metres, and their span averages on the east wall a little under 3·85 metres, while the width of the pilasters averages 1·55 metres. The arches are composed of two rings of stone voussoirs, the inner ring laid vertically; i.e. with the broadside showing, the outer ring laid horizontally, with the narrow end showing. Dr. Reuther notices that in some instances the horizontal outer ring is lacking. The walls and pilasters, like all the walls of Ukhaiḍir, are built of thin irregular slabs of stone, very roughly coursed, with a binding course laid through them at intervals. In or above the binding courses are holes for wooden beams. There are four such holes in each pilaster and one in the spandrel between the arches. In the back wall of each arcade there are three holes up the centre, and two level with the springing of the arch. Similar holes for beams occur in all the walls of Ukhaiḍir. At a height of 1·50 metres above the level of the arches, the wall is set back ·40 metre and broken by windows, 11·80 metres above the ground, and 1·80 metres above the floor of the chemin de ronde. As the authors of _Ocheïdir_ have observed, these windows cannot have served any purpose of defence, since they are so high above the floor. There was thus no means of attacking from the wall a foe who had penetrated into the palace yard. Between each pair of windows, shallow pilasters, corresponding to the pilasters below, are carried up to the top of the wall. There are holes for beams between the window arches on wall and pilaster, and also directly above, along the top of the wall. On the exterior there is again a blind arcade 1 metre deep, consisting of two round arches between each tower (Plate 7, Fig. 2). The towers have a projection of 2·75 metres beyond the face of the arcade. The exterior arches bear no relation to the arches of the interior arcade. Two arches, with an average span of 3·85 metres, separated by a pilaster 1·60 metres wide, stand between each of the piers, 4·10 metres wide, against which the three-quarter round towers are placed. There are five of these towers between gateway and angle tower. They have a diameter of 3·30 metres, whereas the angle towers have a diameter of 5·10 metres. The holes for beams appear as on the inner side of the wall, but they do not correspond with the interior holes.