The main courtyard (sahn) occupied roughly the northern half of the mosque, measuring 24 by 18.6 meters.[1]:39 Like in other mosques, it has a central water bassin (formerly linked to two other fountains on either side) and is surrounded by arched galleries.[3] The floor is paved with mosaic tiles (zellij).[3] The central arch on the south side of the courtyard, which leads into the central "nave" of the prayer hall on the axis of the mihrab, is framed and surmounted by a tall and ornate portal.