It once included an hexagonal pool of water and the usual green pyramidal roofs which were all aligned with the central axis of the Arsat an-Nil. However, since the 18th century various other structures and rooms have been added or modified in this area, such that it has now lost its symmetry. It still has a large symmetrical courtyard featuring two halls with pyramidal roofs that face each other on its east-west axis, but the surrounding structures have a more irregular layout.[1]:484[2]:397