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Siang dam debate: local fears over proposed project in Arunachal Pradesh

9 November 2026 · ⏱ 2 நிமிடம் · GS Paper 1/3 - Geography / Infrastructure

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ஏன் செய்தியில்?

One river, three names: why the Siang dam row is a GS1/GS3 Brahmaputra question

Local resistance to the Siang dam continues; the Siang is the Brahmaputra's upper course in Arunachal.

Why it matters: factual, Prelims-type

Siang dam debate: local fears over proposed project in Arunachal Pradesh
ঈশান জ্যোতি বৰা · CC BY-SA 4.0 · Wikimedia Commons
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What you need to know

2 நிமிடம்

Opposition from local communities continues over a large dam proposed on the Siang river in Arunachal Pradesh, amid fears of loss of land and homes.

The Siang is the name the Brahmaputra carries in Arunachal; upstream in Tibet it is the Yarlung Tsangpo.

The project is linked to flood moderation and to strategic concerns about dams upstream in China.

ஆதாரங்கள்: Topper IAS editorial (PIB / The Hindu / Indian Express)

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முக்கிய உண்மைகள்

Remember these

  • The Siang is the name the Brahmaputra carries in Arunachal Pradesh.
  • Upstream in Tibet the same river is called the Yarlung Tsangpo.
  • The proposed Siang dam is linked to flood moderation and to strategic concerns about Chinese dams upstream.
  • Local communities fear loss of land and homes and continue to oppose the project.
  • The Lohit and Subansiri are separate Brahmaputra tributaries in Arunachal.
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ப்ரிலிம்ஸ் · மெயின்ஸ்

How the exam will ask it

ப்ரிலிம்ஸ்

  • The Siang is the upper course of the Brahmaputra in Arunachal Pradesh and is known as the Yarlung Tsangpo in Tibet.
  • The Lohit and Subansiri are tributaries of the Brahmaputra and are distinct from the Siang.
  • Large storage dams on trans-boundary rivers raise both flood-moderation and downstream water-security considerations.

மெயின்ஸ்

GS Paper 1/3: Geography and Infrastructure. Issue: a large dam on the Siang is pitched for flood moderation and as a strategic counter to upstream Chinese dams, but local communities fear displacement. Policy: balance rehabilitation and consent norms with trans-boundary river management; way forward is transparent impact assessment, fair rehabilitation and regional water diplomacy.

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Quick recall

Answer before you reveal

The Siang river of Arunachal Pradesh is known by which name in Tibet?

  1. Lohit
  2. Yarlung Tsangpo
  3. Subansiri
  4. Manas
விடையைக் காட்டு

விடை: B — Correct: Yarlung Tsangpo — The Siang is the Brahmaputra's course in Arunachal and is called the Yarlung Tsangpo in Tibet. • Lohit — wrong: The Lohit is a separate tributary of the Brahmaputra in eastern Arunachal. • Subansiri — wrong: The Subansiri is a different tributary that joins the Brahmaputra downstream. • Manas — wrong: The Manas flows through Bhutan and Assam and is not the Siang's Tibetan name.

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