Roman castra of Dajaniya, Roman military fortress in Ma'an Governorate, Jordan

The Roman castra of Dajaniya is a ruined military fortress built from local basalt stones in the desert. Its internal layout with barrack areas, storage rooms, and central command building follows the standard Roman military fort design.

The fort was built in late antiquity as an outpost between other legion bases to monitor trade and movement on a major route. It remained in use for about 200 years before declining in importance as political boundaries shifted.

The fort's name, Dajaniya, comes from the local Al-Husseiniyeh area; the site lies about 4.6 km north-northeast of the village. Visitors can still see the roughly square enclosure with towers projecting from the wall line, a plan adapted from a late-antique military model. The Via Traiana Nova ran about 13 km west, and a road branch passed the fort.

The site is remote and sits in open desert with no shelter from sun or shade. Visitors should arrive early in the day, bring plenty of water, and wear proper footwear for uneven ground.

The fort's plan was first drawn by Alfred von Domaszewski and Rudolf Ernst Brünnow during their 1897 and 1898 travels along the Roman limes; their published volumes contain the earliest plan of the site. In November 2018 a Polish team from the Jagiellonian University in Kraków recorded the surviving walls by laser scanning and close-range photogrammetry.