Gangi is a perennial river and a tributary of Ganga which mainly flows near the Arrah town of Bihar in India. It originates from Keshavpur, which is from Arrah and again meets the Ganga in the Buxar district. History It is believed it is the ancient stream of the river Ganga. Huien Tsang has written in his account that Ganga was 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. The high bank of old river bed can still be traced in Bhojpur and Buxar. Course 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. The Ara Canal falls into it near Ramsara Chandar Chur. References Tributaries of the Ganges Rivers of Bihar Arrah