What are the extent and location of river Ganga?
Source - Gangotri Glacier, Uttarakhand, India. Mouth - Ganges Delta, Bay of Bengal, Bangladesh. Length of 1,560 miles.
Ganga river is fed by many perennial rivers and steams in its higher course. Mandakini originates from a glacier near Kedarnath in Uttarakhand (a state in India). Mandakini joins Alaknanda at Rudraprayag which in turns proceed to meet Bhagirathi river in Devaprayag to form river Ganga. As being one of ganga's tributaries, Mandakini is a synonym for river Ganga.
The Ganges river gets the name from the goddess Ganga please research more on sites such as wikipedia by searching Ganges river and scrolling down to the Hinduism paragraph The Ganges River got its name after the Hindu god Ganga. Hindus believe the river is a physical embodiment of Ganga and washes away sins.