The Ganga River originates in the Himalayas at Gangotri Glacier in Uttarakhand, India. The source stream of the Ganga is called Bhagirathi. 

How does the Ganga River form?

The Bhagirathi River originates from the Gangotri Glacier at Gaumukh. 

The Bhagirathi River flows down the Himalayas. 

At Devprayag, the Bhagirathi River joins the Alaknanda River, and the river is then called the Ganga. 

The Ganga flows into the Bay of Bengal. 

Other details about the Ganga River

The Ganga River is also known as the Ganges River. 

The Ganga River is about 2,525 km long. 

The Ganga River has many tributaries, including the Yamuna, the Ramganga, the Ghaghra, and the Gandak. 

The Ganga River is a sacred place for Hindu pilgrimage. 

The source stream of the Ganga in the Himalayas is named Bhagirathi, which means "of Bhagiratha" in Sanskrit.