Answer: Gangotri Glacier is the source of the Ganga River. It lies in the Uttarkashi district in the Indian state of Uttarakhand. At Devprayag in Uttarakhand, the rivers Bhagirathi and Alaknanda converge to form the Ganges. At Haridwar, the Ganga emerges from the mountains and flows into the plains.
Yamuna, Kosi, Gandak, and Ghaghara are the Ganga’s principal tributaries. Prayagraj is where the Ganga and the Yamuna rivers meet. Allahabad was the previous name for the city. River Son, River Betwa, and River Chambal are the other major tributaries of the Ganga. The peninsular uplands give rise to these rivers.