In Class 9 Geography (Drainage), we study two of the most sacred and historically significant rivers of the Indian subcontinent: the Indus (Sindhu) and the Ganga. Both originate from the high Himalayan region.
The Ganga is considered sacred in Hinduism — over 400 million people live along its banks and depend on it for drinking water and agriculture. It is worshipped as the goddess Ganga Mata.
The Indus River (Sindhu) originates from a glacier near Lake Manasarovar on the Tibetan Plateau in China (altitude ~5,500 m above sea level).
From Tibet, it flows northwest into Ladakh (India), passes through Gilgit-Baltistan (Pakistan-administered), and then flows southwest through Pakistan, finally emptying into the Arabian Sea near Karachi.
Total length: ~3,180 km (one of the longest rivers in Asia).
The Ganga River originates from the Gangotri Glacier in the Uttarakhand Himalayas (altitude ~7,010 m). The point where the glacier melts and gives birth to the Ganga is called Gaumukh (meaning 'Cow's Mouth' due to the glacier's shape).
The river is initially called the Bhagirathi at its source. It is joined by the Alaknanda River at Devprayag, after which the combined river is officially called the Ganga.
Total length: ~2,525 km — it flows east across the Indo-Gangetic Plain and empties into the Bay of Bengal.
Both rivers flow through the massive, extremely fertile Indo-Gangetic Plain — the agricultural heartland of South Asia. This vast alluvial plain, built up over millions of years by river sediment, supports the highest population density in the world.
The **Indus** is longer overall (3,180 km total), but a larger portion of the **Ganga** flows within India. Within Indian territory alone, the Ganga (2,525 km) flows more than the Indus (only ~1,114 km of the Indus is in India).
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