Extremely 'hot in summer, and with an elevation of 120 meters above sea level, Dezful is located 160 km to the north o. Its name meaning Bridge Fortress, is derived from the name of a bridge built on the perennial Ab-e Dez or Dez river during the reign of Shapour I (242-271 AD) using Roman soldiers taken prisoner at the battle of Edessa in 260 AD. The bridge is 120 meters long and consists of twenty-two arches. Its foundation and stone piers are Sassanian, while the arches and the roadway are more recent.

 The Arabs admired the bridge, calling the town al-Qantara (The Bridge), a name to stir memories of the Spanish Alcantara, from the same root. Until very recent years, the inhabitants had the sensible summer custom of retiring from their houses into an underground chamber {sardab) hewn out of the friable rock. Andimeshk city (II km) and Dez Dam (32 km) are in the vicinity of Dezful.

From the architectural point of view and on account of its ancient prayer hall and stone columns with evident signs of deterioration and wear the Jam'e Mosque of Dezful counts as one of the early Islamic monuments, which has been further expanded and repaired in the 13th and 18th centuries AD. The date 1744 AD inscribed on the portal of the Mosque, is indicative of such repairs.

The eastern ivan of the mosque has been constructed in 1698 AD under the Safavids, while its portal and minarets belong to the 18th century AD. The whole structure is an imitation of the techniques used in Ivan-e Karkheh.