The formation of the River Ganga, one of India's holiest rivers, occurs at a significant confluence point in the Himalayas. The two primary rivers that merge to form the Ganga are the Bhagirathi and the Alaknanda.
The Bhagirathi river, considered the headstream of the Ganga, originates from the Gangotri Glacier in Uttarakhand. The Alaknanda river originates from the Satopanth Glacier, also in Uttarakhand.
These two mighty rivers flow through different valleys before meeting at a specific location. The place where the Bhagirathi and Alaknanda rivers join their waters is known as **Devprayag**. It is at this sacred site that the river officially becomes known as the Ganga.
Devprayag is a town situated in the Tehri Garhwal district of Uttarakhand. It is considered one of the 'Panch Prayag' (five sacred confluences) of the Alaknanda river. The confluence at Devprayag is a major pilgrimage site, revered for marking the birth of the Ganga river.
Therefore, the Bhagirathi and Alaknanda join to form the Ganga at Devprayag.