Ganga River Originate when Bhagirathi River and Alaknanda Confluence takes place at dev prayag. Alaknanda with other tributaries like Nandakini, dhauli ganga, pindar ganga, forms prayag like vishnu prayag, rudra prayag etc. it enters in up, bihar, westbengal and jharkhand. it has various tributaries like damodar, yamuna, son and left bank tributaries like ramganga, gomati, ghaghara etc.