A river is a large, natural stream of fresh water that flows across the land and eventually meets the sea or a lake. Rivers have shaped civilisations and are considered sacred in India.
Where does a river begin?
Most rivers begin in the mountains, where glaciers melt or heavy rain falls. The starting point is called the source. Water flows downhill, joining small streams called tributaries, growing bigger as it moves forward.
- The journey of a river:
- Upper course (mountains): Fast, narrow flow; cuts through rocks forming V-shaped valleys and waterfalls.
- Middle course (plains): River slows, widens, and bends. These bends are meanders. Silt is deposited on banks.
- Lower course (near sea): Very wide and slow. Deposits fine soil called silt. Where it meets the sea, a delta forms — a fan-shaped land area.
The mouth is where the river meets the sea or a lake.
Why are rivers important?
Rivers give us fresh water for drinking and farming. River banks have fertile soil. Ancient civilisations grew along rivers. Today rivers support transport, fishing, and hydroelectric power.
The Ganga begins at the Gangotri glacier in the Himalayas and empties into the Bay of Bengal, forming the Sundarbans delta.
Near Rishikesh, the fast-flowing Ganga cuts through rocks forming narrow gorges and waterfalls.
In the plains of Uttar Pradesh, the Ganga flows slowly, forming wide meanders. Farmers here grow wheat and rice on silt-rich soil.
The Brahmaputra in Assam floods its banks each monsoon, depositing rich silt that makes surrounding farmland very fertile.
The Sundarbans delta (West Bengal and Bangladesh), formed by the Ganga and Brahmaputra, is home to the Royal Bengal Tiger and unique mangrove forests.
Common mistakes
Do not confuse a river's source (where it begins, in mountains) with its mouth (where it ends, at the sea or lake).
Summary
A river begins at its source, journeys through mountains and plains, and reaches the sea at its mouth. It provides water, fertile soil, and supports life. Keeping rivers clean is our responsibility.