| Official Name: | Qasr Tuba |
| Other Name: | Qasr al-Tuba |
| Native Name: | Arabic: قصر طوبة |
| Pushpin Map: | Jordan |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in Jordan |
| Subdivision Type: | Country |
| Subdivision Type1: | Governorate |
| Subdivision Name1: | Amman Governorate |
| Established Date: | 743 BCE |
| Unit Pref: | Imperial |
| Population Blank1 Title: | Ethnicities |
| Population Blank2 Title: | Religions |
| Timezone: | UTC + 2 |
| Coordinates: | 31.3256°N 36.5708°W |
31.3256°N 36.5708°WQasr Tuba is an 8th-century Umayyad qasr or castle in the Amman Governorate of northern Jordan.
Qasr at-Tuba is the southernmost of the Umayyad desert castles in Jordan. Built in 743 CE by Caliph al-Walid II for his sons, al-Hakam and ‘Uthman,[1] it was initially intended to consist of two roughly 70m2 courtyard dwellings with projecting semicircular decorative towers, but the project was never completed.[2] The structure appears to have been abandoned some time after the assassination of Caliph al Walid.[3]
The palace at Qasr at-Tuba may have been the residence or hunting lodge of the Caliph's sons,[4] since hunting was a favoured pastime of the aristocracy.[5] It also served as a caravanserai and was part of the Caliph's program to improve the routes to Hijaz,[6] at a time when the number of caravans passing through the region had increased substantially.[7] It lacks the imperial features associated with other desert castles, suggesting that it was used as a temporary or seasonal residence rather than a permanent one.[8]
The site was brought to art historical attention after it was visited in 1896 by the Czech explorer Alois Musil.[9]
It is situated about south-east of the capital, Amman. Its location is relatively isolated, in a desert location and access can be difficult.[10] Most desert castles are located near to a source of water. Qasr al Tuba is no exception; wells are located nearby, close to a dry river bed ("wadi") and the site includes a dam and several wells.[11]
The surviving foundations and structures reveal its current layout as consisting of the west wing only; of an oblong enclosure measuring 140by, almost a double square, or two symmetrical enclosures, each with a grand entrance, connected by an internal corridor, which could be cut off when necessary.[12] The enclosure walls are supported by semi-round towers, except on the north side where the two gateways are flanked by two square rooms. The northwestern section is nearly intact and several lengths of curtain-wall exist on the western side.[13] A prayer chapel has also been identified on the site.[14]
The surviving structures consist of ashlar masonry with baked brick and barrel-vaulted roofs. The lintels are decorated with rosettes, intertwined with plant leaves, which give the impression of fine lace work.[15]
It is a prime example of an Umayyad construction of brick vaults set on brick walls.[16] The Lonely Planet Guide describes it as "easily the most impressive of the lesser-known castles."[17]