UPSC Notes

South China Sea Disputes

PYQs

7

Articles

1

Momentum

19

Phase IFoundation

Background

Overview

A major flashpoint in international relations, impacting regional stability, international law (UNCLOS), freedom of navigation, and the balance of power in the Indo-Pacific, with direct implications for global trade and energy security.

The South China Sea is a strategically vital waterway rich in natural resources, subject to overlapping territorial and maritime claims by several countries, including China, Vietnam, the Philippines, Malaysia, Brunei, and Taiwan. These disputes involve sovereignty over islands, reefs, and shoals, as well as maritime jurisdiction over surrounding waters and their resources.

Phase IIStatic core

Facts & tables

Key facts

Claimants

China, Vietnam, Philippines, Malaysia, Brunei, and Taiwan.

Strategic Importance

Major global shipping lane, rich fishing grounds, and potential oil and gas reserves.

China's Claims

Based on historical maps (Nine-Dash Line), asserting sovereignty over most of the sea, including features far from its mainland.

International Law

UNCLOS is the primary legal framework, but China's claims often conflict with it (e.g., 2016 PCA ruling against China).

Reference table

Static syllabus anchors

TypeReference
Conceptual areaInternational Law
Conceptual areaMaritime Security

Reference table

Institutions & roles

BodyRole
Permanent Court of Arbitration (PCA)Issued ruling on scs disputes
Phase IIIExam lens

Prelims angle

Overview

Prelims angle: Multi-statement analysis

Prelims angle: Factual recall

Quick revision

  • Multiple claimants (China, Vietnam, Phil, Mal, Bru, Tai).
  • Strategic waterway, rich resources.
  • China's 'Nine-Dash Line' claims.
  • Conflicts with UNCLOS (2016 PCA ruling).
  • Impacts freedom of navigation & regional stability.

High-confidence PYQs

Topic timeline

International LawMaritime Security

Iran's demands over the Strait of Hormuz would set a dangerous precedent, Rubio tells Asian leaders

22 Jul 2026 · The South China Sea is a critical maritime region with overlapping territorial claims by multiple nations, notably China's expansive 'Nine-Dash Line' claims, leading to disputes over islands and resources, challenging international law and freedom of navigation.

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Practice writing on this topic

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