The Ganga (Ganges) is the most sacred and the longest river that flows entirely within India. It is the lifeline of the Indo-Gangetic Plain and sustains over 40% of India's population. Understanding its origin (उद्गम/source) is an essential geography topic.
The Ganga is about 2,525 km long in India. The Gangotri Glacier itself is receding (melting) at an alarming rate due to climate change, which poses a serious long-term threat to millions who depend on the river for water.
The Ganga is formed by the confluence of two headstreams:
Bhagirathi River: The Bhagirathi is considered the main source stream of the Ganga. It originates from the Gangotri Glacier (also called Gaumukh, meaning 'Cow's mouth') in the Uttarkashi district of Uttarakhand. The actual source point at the glacier snout is at an altitude of about 3,892 metres above sea level.
Alaknanda River: The Alaknanda originates from the Satopanth glacier near Badrinath.
The Ganga is officially formed when the Bhagirathi and Alaknanda rivers meet at Devprayag (one of the Panch Prayag — five sacred confluences) in Uttarakhand. From this point, the combined river is called the Ganga.
From Devprayag, the Ganga flows in a broad sweep:
**Gaumukh** (meaning 'Cow's Mouth') is the snout of the **Gangotri Glacier**, from which the Bhagirathi River — the main source stream of the Ganga — emerges. It is one of the most important Hindu pilgrimage destinations.
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