UPSC Notes

International Maritime Law & Freedom of Navigation

PYQs

15

Articles

4

Momentum

43

Phase IFoundation

Background

Overview

Fundamental to global trade, energy security, and preventing conflicts in international waters. Understanding its principles is crucial for analyzing geopolitical events involving maritime disputes and strategic waterways.

International Maritime Law, primarily codified by the UN Convention on the Law of the Sea (UNCLOS), governs the rights and responsibilities of nations in their use of the world's oceans, including principles like freedom of navigation through international waters and straits.

Phase IIStatic core

Facts & tables

Key facts

UNCLOS

The primary international treaty governing maritime activities, defining territorial waters, exclusive economic zones (EEZs), and international straits.

Freedom of Navigation

A fundamental principle allowing vessels of all states to navigate freely through international waters and certain straits, subject to specific regulations.

Naval Blockades

Acts of war that can restrict freedom of navigation, subject to strict conditions under international humanitarian law and the law of armed conflict.

Exclusion Zones

Areas declared by a state to restrict access, often for security or environmental reasons, but their legality in international waters can be contested under UNCLOS.

Innocent Passage

Right of foreign vessels to pass through a state's territorial waters, provided it is not prejudicial to the peace, good order or security of the coastal state.

Transit Passage

Specific right for ships and aircraft to navigate through international straits used for international navigation, without impediment.

Core Principle

A fundamental principle of customary international law.

Scope

Ensures unimpeded passage through international waters, including territorial seas (innocent passage) and international straits (transit passage).

Reference table

Static syllabus anchors

TypeReference
Conceptual areaGeopolitics & International Conflicts
Conceptual areaEnvironmental Law & Policy

Reference table

Institutions & roles

BodyRole
United Nations Convention on the Law of the Sea (UNCLOS)Establishes legal framework
United Nations (UN)Facilitates unclos and international law
International Maritime Organization (IMO)Develops and adopts international standards for shipping
International Maritime Organisation (IMO)Regulates maritime safety and navigation
Phase IIIExam lens

Prelims angle

Overview

Prelims angle: Factual recall

Prelims angle: Multi-statement analysis

Quick revision

  • Governed by UN Convention on the Law of the Sea (UNCLOS).
  • Ensures freedom of navigation in international waters.
  • Defines territorial waters, EEZs, and international straits.
  • Naval blockades and exclusion zones raise legal questions.
  • Crucial for global trade and maritime security.

Elimination traps

Body vs treaty — UNCLOS is a treaty, not an implementing body.

Treaty = agreement between states; body = institution.

High-confidence PYQs

Topic timeline

Geopolitics & International ConflictsEnvironmental Law & Policy

U.S. launches new strikes on Iran after Trump vows to hit 'hard'

09 Jul 2026 · A core principle of international law ensuring free passage for ships, vital for global commerce and often challenged in strategic maritime zones, leading to geopolitical tensions.

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Iran says plans to announce new ‘exclusion zone’ near Strait of Hormuz

07 Sep 2026 · International Maritime Law, primarily UNCLOS, establishes rules for ocean use, including freedom of navigation, which is often challenged by actions like naval blockades or unilaterally declared exclusion zones.

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Togo-flagged tanker stuck in Strait of Hormuz: Iran Guards

18 Sep 2026 · UNCLOS-based framework governing ocean use, ensuring freedom of navigation, innocent passage, and transit passage through strategic waterways.

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Doval speaks to Iran NSA, discusses ‘latest developments’ after ships attacked in Hormuz

13 Oct 2026 · Freedom of Navigation, a key principle of international law (UNCLOS), guarantees unimpeded passage through international waters and straits, essential for global trade and maritime security.

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Related topics

Practice writing on this topic

UPSC has asked 15 linked questions on International Maritime Law & Freedom of Navigation in Mains. Write an answer to one — and get it evaluated.

UPSC Prelims PYQs on International Maritime Law & Freedom of Navigation

Practice official previous year questions asked by UPSC related to this concept.

With reference to the United Nations Convention on the Law of Sea, consider the following statements: 1. A coastal state has the right to establish the bread...

2022·International Relations
Solve

Consider the following in respect of the Indian Ocean Naval Symposium (IONS): 1. Inaugural IONS was held in India in 2015 under the chairmanship of the Indi...

2017·International Relations
Solve

With reference to the United Nations General Assembly, consider the following statements: 1. The UN General Assembly can grant observer status to the non-mem...

2022·International Relations
Solve

With reference to ‘Indian Ocean Rim Association for Regional Cooperation (IOR-ARC)’, Consider the following statements: 1. It was established very recently i...

2015·International Relations
Solve

Consider the following statements: Statement-I : Sumed pipeline is a strategic route for Persian Gulf oil and natural gas shipments to Europe. Statement-II ...

2024·Geography
Solve

Consider the following pairs : Regions : often Reason for being in news 1. North Kivu and Ituri : War between Armenia and Azerbaijan 2. Nagorno-Karabakh : In...

2023·International Relations
Solve

India is one of the founding members of the International North-South Transport Corridor (INSTC), a multimodal transportation corridor, which will connect

2025·International Relations
Solve

Which one of the following statements best reflects the issue which Senkaku Islands, sometimes mentioned in the news?

2022·International Relations
Solve

Consider the following statements regarding the India-Africa Forum Summit (IAFS): 1. The summit held in 2015 marked the third edition of the IAFS. 2. The IAF...

2016·International Relations
Solve

Which of the following is not a member of ‘Gulf Cooperation Council’?

2016·International Relations
Solve

Consider the following statements : Statement-I: Recently, the United States of America (USA) and the European Union (EU) have launched the 'Trade and Techn...

2023·International Relations
Solve

In the Indian context, what is the implication of ratifying the 'Additional Protocol' with the `International Atomic Energy Agency (IAEA)'?

2018·International Relations
Solve

Which of the following connectivity projects is/are a part of cooperation between India and the ASEAN member countries ? 1. Kaladan Multi-Modal Transit Tran...

2026·International Relations
Solve

With reference to the “United Nations Credentials Committee”, consider the following statements: 1. It is a committee set up by the UN Security Council and w...

2022·International Relations
Solve

Consider the following statements : Statement-I : There is instability and worsening security situation in the Sahel region. Statement-II: There have been m...

2024·International Relations
Solve

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