Qasr Al-Hallabat,

Qasr Al-Hallabat lies 25 km northeast of Zarqa and 55 km northwest of Azraq Fort. The site comprises a conglomerate of separate and widely spaced units.

These include a palace (qasr), a mosque, a huge reservoir, 8 cisterns dug into the western slope, an irregularly shaped agricultural enclosure with an elaborate system of sluices, and a cluster of poorly built houses which extend to the northwest of the reservoir. The bath complex of Hammam Assarah, is situated 2 km to the east of the qasr.

Originally Roman, this castle was rebuilt during the Umayyad period when it was elaborately decorated in mosaics, carved stucco, and fresco paintings, thus transforming the castle into a palatial residence. There are about 150 inscriptions within the castle, mostly in Greek. The vast majority of these inscribed stones, which were reused as building material, belong to an edict issued by the Byzantine Emperor Anastasius (491-518 AD).

The Umayyad rebuilding program was accompanied by a remarkable development of the site: the addition of an extra-mural mosque with its beautiful cusped arches; the agricultural enclosure with an elaborate irrigation system; and the bath complex of Hammam Assarah.