Qasr Tuba,

Tuba is located about 95 km southeast of Amman. Like Mushatta, it was built using a combination of limestone blocks and baked bricks. Its plan consists of an oblong enclosure measuring 140 m by 72 m, almost a double square, or 2 symmetrical enclosures joined through a long central corridor.

The enclosure walls are buttressed by semi-round towers, except on the north side where the 2 gateways are flanked by 2 square rooms. The northwestern quadrant is nearly intact and several lengths of curtain-wall exist on the western side. The rest of the building, which was never completed, is unpreserved.