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Difficulty: Very hardDrainage System and Water Resources of India

Arrange the following right-bank (north-bank) tributaries of the Brahmaputra River in sequential order from West to East based on the locations of their confluence points with the main Brahmaputra channel:

  1. 1Teesta River
  2. 2Sankosh River
  3. 3Manas River
  4. 4Kameng River (Jia Bhareli)
  5. 5Subansiri River

Answer

The correct order from West to East is: Teesta River → Sankosh River → Manas River → Kameng River (Jia Bhareli) → Subansiri River.
The correct spatial sequence from West to East of the right-bank (north-bank) tributaries of the Brahmaputra River is Teesta River (westernmost, ~89.7° E), followed by Sankosh River (~89.8° E), Manas River (~90.6° E), Kameng River (~92.8° E), and Subansiri River (easternmost, ~94.0° E).

Step-by-Step Solution

1
Identify the westernmost north-bank tributary.
Teesta River originates in Sikkim and enters the Brahmaputra system in northern Bangladesh (approx. 89.7° E longitude).
Teesta is the westernmost major right-bank tributary of the Brahmaputra basin.
2
Locate the second tributary moving eastward.
Sankosh River flows from Bhutan along the West Bengal–Assam border, joining near Dhubri (approx. 89.8° E longitude).
Sankosh lies immediately east of the Teesta basin.
3
Locate the central tributary.
Manas River flows out of Bhutan into Assam, joining the Brahmaputra at Jogighopa in Bongaigaon district (approx. 90.6° E longitude).
Manas is situated between Sankosh to its west and Kameng to its east.
4
Identify the next major tributary to the east.
Kameng River (Jia Bhareli) flows from Arunachal Pradesh to join the main channel at Tezpur (approx. 92.8° E longitude).
Tezpur is positioned well to the east of Bongaigaon and to the west of Lakhimpur.
5
Identify the easternmost tributary in the sequence.
Subansiri River enters from Tibet/Arunachal Pradesh and joins near Lakhimpur district / Majuli island (approx. 94.0° E longitude).
Subansiri is the easternmost tributary among the list before reaching the Dibang/Lohit confluence point.

Key Concept

Spatial longitudinal alignment of the north-bank (right-bank) Himalayan tributaries of the Brahmaputra River system.
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Topics

Drainage System and Water Resources of India

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