Gangi is a perennial river and a tributary of the Ganga which mainly flows near the town of Arrah in Bihar in India.
It originates from Keshavpur, which is 10 km (6.2 mi) from Arrah and again meets the Ganga in the Buxar district.
[5][6] Huien Tsang has written in his account that Ganga was 10 km (6.2 mi) from the village of Masarh which also indicates that earlier the Ganga used to flow faster in the South than present which is the present route of Gangi.
[7] The high bank of old river bed can still be traced in Bhojpur and Buxar.
[citation needed] It originates from the mainstream of Ganga in Barahara in Bhojpur district and flows from north east part of Arrah to the south - west part and meets again Ganga in Buxar.