Shahabad district

Shahabad district (Bhojpuri pronunciation: sāhābāda, साहाबाद), headquartered at Arrah, was a historic administrative district in British India. Making up the westernmost part of modern-day Bihar, its territory was defined by the Ganges river to the north and the Son River to the east, which traditionally separated the Bhojpuri-speaking culture of Shahabad from the Magahi culture of Magadh.

In 1972, the district was bifurcated into Bhojpur and Rohtas, which were later subdivided to create the four present-day districts that occupy its former territory.