Qasr Tuba is a castle in the Amman Governorate of northern Jordan. Like Qasr Mshatta, it was built using a combination of limestone 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 supported by semi-round towers, except on the north side where the 2 gateways are flanked by 2 square rooms. The northwestern section is nearly intact and several lengths of curtain-wall exist on the western side. There are also wells located nearby, close to a dry river bed.