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Brahmaputra River

geography Maturity 7-9 Next article →

The Brahmaputra is a massive trans-boundary river system. It flows through southwestern China, northeastern India, and Bangladesh.

Brahmaputra-river-basin
Brahmaputra-river-basin

It is a vital part of the Earth's geography. This river is the 15th longest river in the world. It also ranks as the 9th largest river by discharge. Discharge refers to the volume of water flowing through a river.

Brahmaputra from ganden3
Brahmaputra from ganden3

The river carries many different names in different languages. In Tibet, it is called the Yarlung Tsangpo. In Assamese, it is called the Luit. In Bangladesh, it is known as the Jamuna.

Bangladesh LOC 1996 map
Bangladesh LOC 1996 map

The river begins its journey in the high mountains of Tibet. It originates on the Angsi Glacier near Mount Kailash. This area is on the northern side of the Himalayas.

From its source, the river flows east for a long distance. It runs between the Himalayas to the south and the Kailas Range to the north. During this stage, the river receives several important tributaries. The Raka Zangbo and the Lhasa join it from the left bank. The Nyang Qu meets it from the right bank. After passing Pi, the river turns sharply toward the north and northeast. It cuts through narrow, deep gorges between mountain massifs. One famous section is the Yarlung Tsangpo Grand Canyon. The canyon walls rise up for thousands of meters on each side.

After exiting the mountains, the river enters India. It crosses the China-India line of actual control into Arunachal Pradesh.

Brahmaputra River SPOT 1125
Brahmaputra River SPOT 1125

In this state, the river is called the Siang or Dihang. It makes a rapid descent from its high mountain altitude. The river then flows into the Assam Valley. Here, it is joined by the Dibang and Lohit rivers. Once these join, the river is called the Brahmaputra. It becomes very wide in the Assam plains. In some parts, the width reaches 9.5 kilometers. The river is a classic example of a braided river. A braided river consists of many small channels that weave together.

Sunset in Dibrugarh
Sunset in Dibrugarh

This weaving pattern creates the Majuli island. Majuli is the largest river island in the world.

Bank of Brahmaputra river-Guwahati 2
Bank of Brahmaputra river-Guwahati 2

The river's path is shaped by geological forces. The Brahmaputra is an antecedent river. This means the river existed before the Himalayas were even formed. As the mountains rose, the river cut its way through them. The river's course also changes due to tectonic activity. In 1762, a massive 8.8 magnitude earthquake occurred. This earthquake caused the land to move. This movement switched the main river channel southward. This event opened the Jamuna channel in Bangladesh.

Brahmaputra from ganden3
Brahmaputra from ganden3

Because of this, the river is highly susceptible to avulsion. Avulsion is when a river suddenly abandons its old path for a new one.

In Bangladesh, the river system becomes even more complex. The Brahmaputra is joined by the Teesta River. Below this, the river splits into two main branches. The western branch is the Jamuna. It carries most of the water and flows south. The eastern branch is the Old Brahmaputra.

Bangladesh LOC 1996 map
Bangladesh LOC 1996 map

The Jamuna eventually merges with the Ganges, which is called the Padma in Bangladesh. These waters then meet the Meghna River. Finally, the water empties into the Bay of Bengal. This area forms the Ganga-Brahmaputra Delta. This delta is one of the largest in the world.

The hydrology of the river is extremely powerful. The Ganges-Brahmaputra-Meghna system has the second-greatest discharge on Earth. The Brahmaputra alone provides about 50% of that total discharge. The river also carries a massive amount of sediment. Sediment is the sand, silt, and clay carried by water. The combined sediment load of this river system is 1.87 billion tonnes per year. This is the highest in the world.

Brahmaputra River SPOT 1125
Brahmaputra River SPOT 1125

The river also exhibits a tidal bore. A tidal bore is a strong wave that travels up a river during high tide. This is a rare feature for a river of this size.

Climate plays a major role in how the river behaves. The river has two high-water seasons. The first season is in early summer due to melting snow. The second season is in late summer due to monsoon rains.

Rising temperatures cause more snow to melt in the mountains. This increase in melting leads to higher water levels downstream. This can cause catastrophic flooding and erosion. The river is very important for the people living nearby. It is used for irrigation to grow crops. It is also a major route for transportation.

Naokhel At sualkuchi
Naokhel At sualkuchi

Despite the dangers of floods, the river remains a vital lifeline for the region.

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🖼️ Images & Media (14)
File:Yarlong Tsangpo.jpg
Yarlong Tsangpo.jpg
File:Brahmaputra from ganden3.jpg
Brahmaputra from ganden3.jpg
File:Brahmaputra-river-basin.png
Brahmaputra-river-basin.png
File:Sunset in Dibrugarh.jpg
Sunset in Dibrugarh.jpg
File:Bank of Brahmaputra river-Guwahati 2.jpg
Bank of Brahmaputra river-Guwahati 2.jpg
File:Bangladesh LOC 1996 map.jpg
Bangladesh LOC 1996 map.jpg
File:Bangladesh tmo 2011313.jpg
Bangladesh tmo 2011313.jpg
File:Naokhel At sualkuchi.jpg
Naokhel At sualkuchi.jpg
File:Brahmaputra Plains in Goalpara District of Assam 857.jpg
Brahmaputra Plains in Goalpara District...
File:Brahmaputra River SPOT 1125.jpg
Brahmaputra River SPOT 1125.jpg
File:Brahmaputra system.png
Brahmaputra system.png
File:1776 Rennell - Dury Wall Map of Bihar and Bengal, India - Geographicus - BaharBengal-dury-1776.jpg
1776 Rennell - Dury Wall Map of Bihar and...

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