Consider the following tributaries of the Brahmaputra River in India:

1. Dibang

2. Subansiri

3. Lohit

4. Manas

Which of the following represents the correct order in which these tributaries join the Brahmaputra, from upstream to downstream?

The correct answer is option 2.

Key Points

• The Brahmaputra River enters India from Tibet (where it is called Tsangpo) and flows through Arunachal Pradesh and Assam before entering Bangladesh.
• Tributaries join in the following order:
  • Dibang (Joins first, from Arunachal Pradesh)
  • Lohit (Joins next, merging with Dibang before entering Assam)
  • Subansiri (Largest tributary of Brahmaputra, joins later in Assam)
  • Manas (Joins much further downstream, closer to western Assam)
    • Thus, the correct order is:
      • Dibang → Lohit → Subansiri → Manas
      • Correct Answer: (b) Dibang → Lohit → Subansiri → Manas