The Ganga river system is the largest in India having a number of perennial and non-perennial rivers originating in the Himalayas in the north and the Peninsula in the south, respectively.
It accounts for 26.3% of the geographical area of the country and is shared by ten states.
Ambala is located on the water divide between Indus and Ganga.
Origin: It rises in the Gangotri glacier near Gaumukh in the Uttarkashi district of Uttaranchal. Here, it is known as the Bhagirathi.
At Devprayag, the Bhagirathi meets the Alaknanda; hereafter, it is known as the Ganga.
