RAS question
The Dibang and Lohit rivers enter India through which state?
Correct answer: (B) Arunachal Pradesh.
The Dibang and Lohit rivers enter India through Arunachal Pradesh from Tibet (China).
Explanation
Dibang and Lohit are linked to Arunachal Pradesh, not to Nagaland, Manipur, or Sikkim. Both rivers enter India from Tibet (China) through Arunachal Pradesh and later meet the Brahmaputra in Assam. The Central Water Commission, Brahmaputra & Barak Basin Organization places Arunachal Pradesh within the Brahmaputra sub-basin and lists Dibang and Lohit among the principal tributaries of the Brahmaputra in India. Part of Arunachal Pradesh also took the older name Lohit from the river. RAS geography frequently connects trans-Himalayan tributaries with their Indian entry state before tracing their downstream course.
Why the other options are wrong
- (A) Nagaland's major river associations include Doyang and Dhansiri, not the Indian entry of the Dibang and Lohit.
- (C) Manipur is associated with the Barak river system, while Dibang and Lohit are tied to the Brahmaputra system through Arunachal Pradesh.
- (D) Sikkim is linked with the Teesta river, so it does not fit the Dibang-Lohit entry route from Tibet into Arunachal Pradesh.
Concept
The Brahmaputra river system includes Himalayan tributaries whose Indian entry routes are important for state-river matching. RAS often frames river systems through state-river matching rather than long descriptive geography.