The castle is just south of Highway 40, an important desert road that links Amman with Azraq, the Saudi Arabian border and remote areas of Eastern Jordan and Iraq. It sits on a slight rise just 15 metres (49 ft) above the surrounding desert. The only other structures in the area are power lines.
The area is fenced off with a visitors' center on the southeast corner, where the main entrance to the castle area is located. An unpaved driveway leads from the highway to a dirt parking lot large enough for cars and several buses located just south of the entrance.
The building itself is a square 35 metres (115 ft) on each side, with small projecting corner towers and a projecting rounded entrance on the south side. It is made of rough limestone blocks set in a mud-based mortar. Decorative courses of flat stones run through the facing.
On the inside the building has 60 bayt, or rooms on two levels arranged around a central courtyard, with a rainwater pool in the middle. Many of the rooms have small slits for light and ventilation. Some of the rooms are decorated with pilasters, medallions and blind niches finished in plaster. A graffito in one of the upstairs rooms has allowed the building to be dated to ca. 710
