What rules govern international waters?

1. At a Glance

• International waters (high seas) are governed by the UN Convention on the Law of the Sea (UNCLOS), 1982, the "constitution for the oceans," alongside customary international law [1].
• UNCLOS zones the ocean into territorial sea, contiguous zone, EEZ, continental shelf, high seas and the deep seabed ("the Area"), each with different sovereign rights [1].
• Live relevance: the 2026 Iran–U.S. conflict over the Strait of Hormuz has tested freedom-of-navigation rules, chokepoint law, and UNSC crisis-response mechanisms — a ready-made current-affairs peg for a static legal topic [2][3][4].
• UPSC relevance: tests GS-II (international law/institutions) and GS-III (maritime security, India's energy trade), often via a "static base + current trigger" question.

2. Why in the News

• War broke out around the Strait of Hormuz on 28 February 2026; transits fell from ~100 vessels/day to a handful within a day [4].
• Iran instituted a toll-based, geopolitically discretionary transit system, reportedly charging over $1 million per ship; India said it paid no toll and only exercised free-navigation rights under international law [4].
• The U.S. seized two ships (including a large Iran-linked crude carrier) on the high seas between Sri Lanka and Indonesia; Iran retaliated by attacking three ships and detaining two in its territorial waters [4].
• UN Secretary-General Guterres warned the Security Council that disruptions imperil global energy security, food supply, and trade — the Strait carries ~1/5 of global oil trade and ~1/3 of internationally traded fertilizers [3].
• A Bahrain-drafted UNSC resolution urging coordinated safety-of-navigation efforts failed after Russia and China voted against it (May 2026) [3].
• Up to 20,000 seafarers on ~2,000 vessels were reported stranded in the Persian Gulf due to the blockade [2].

3. Background & Evolution

• Customary "freedom of the seas" doctrine dates to 17th-century Grotian mare liberum principles; codified multilaterally only in the 20th century.
• 1958: Four Geneva Conventions on the Law of the Sea (territorial sea, high seas, continental shelf, fishing) — first codification attempt.
• 1973–1982: Third UN Conference on the Law of the Sea (UNCLOS III) negotiated the comprehensive treaty.
• 10 December 1982: UNCLOS opened for signature at Montego Bay, Jamaica [5].
• 1994: UNCLOS entered into force, supplemented by the 1994 Implementation Agreement on deep-seabed mining.
• UNCLOS created three institutions: the International Tribunal for the Law of the Sea (ITLOS), the International Seabed Authority (ISA), and the Commission on the Limits of the Continental Shelf (CLCS).
• 2026 crisis: first major test in decades of chokepoint transit rights and UNSC crisis mediation over a strait used for international navigation.

4. Core Static Facts

• Straits used for international navigation (e.g., Strait of Hormuz) attract a special UNCLOS regime of "transit passage" — distinct from ordinary "innocent passage" in territorial waters, permitting continuous and expeditious transit including for warships/submarines.
• Enabling instrument: UNCLOS, 1982 (entered into force 1994); India ratified it in 1995.
• Adjudication body: International Tribunal for the Law of the Sea (ITLOS); disputes may also go to the ICJ or arbitral tribunals under Annex VII.
• Key UN body monitoring shipping safety here: International Maritime Organization (IMO) [2].

5. Multi-Dimensional Analysis

Geopolitical/Strategic

• Iran's claim that Hormuz lies within its territorial waters clashes with the international community's transit-passage position — a sovereignty-vs-global-commons dispute [3].
• UNSC gridlock (Russia-China veto of the Bahrain draft) shows how great-power rivalry can paralyse maritime crisis response even over a globally vital chokepoint [3].

Legal/Constitutional

• The core legal question: can a coastal state impose tolls/discretionary permissions on transit passage? India's position — exercising free navigation, not paying toll — asserts UNCLOS transit-passage rights over Iran's assertion of control [4].
• U.S. seizure of ships on the high seas (not in anyone's territorial waters) raises legality questions under UNCLOS's high-seas freedoms and enforcement-jurisdiction rules (flag-state jurisdiction principle).

Economic

• ~1/5 of global oil trade and ~1/3 of traded fertilizers transit Hormuz; disruption directly threatens global energy and food security [3].
• India, dependent on Gulf oil/gas, was a major beneficiary of Iran's permissive-transit list, showing energy-security stakes of maritime law compliance [4].

Administrative/Governance

• Multilateral crisis management runs through the UNSC and IMO, but enforcement remains fragmented since UNCLOS lacks a standing enforcement force — states self-help or coalesce ad hoc [2][3].

6. Recent Developments (last 12-18 months)

• 28 Feb 2026: War breaks out affecting Strait of Hormuz transit; daily vessel transits crash from ~100 to a handful [4].
• Feb–April 2026: Iran runs a discretionary, toll-based transit regime; ~10 Indian-flagged ships and other India-linked cargo permitted through [4].
• ~April 2026: U.S. forces seize two ships including a VLCC linked to Iran on the high seas between Sri Lanka and Indonesia [4].
• 20 April 2026: U.S. forces patrol the Arabian Sea near the Iranian-flagged cargo ship Touska [article dateline].
• April 2026: Iran attacks three ships, detains two in its territorial waters, in reported retaliation [4].
• April 2026: UN reports up to 20,000 seafarers stranded on ~2,000 vessels in the Persian Gulf [2].
• April 2026: UNSC holds session; Guterres warns of energy/food security fallout; Strait framed as a "bargaining chip" [3].
• May 2026: Bahrain's UNSC draft resolution on safety of navigation fails — Russia, China vote against [3].

7. Prelims Hooks

• UNCLOS was opened for signature on 10 December 1982 in Montego Bay, Jamaica [5].
• UNCLOS entered into force in 1994 (12 months after 60th ratification).
• Territorial sea extends to 12 nautical miles from the baseline [6].
• Contiguous zone extends to 24 nautical miles (12 nm beyond territorial sea) [6].
• EEZ extends to 200 nautical miles from baseline [6].
• High seas/international waters lie beyond national EEZs and are open to all states under UNCLOS Part VII.
• Dispute settlement body created by UNCLOS: International Tribunal for the Law of the Sea (ITLOS).
• The 1958 Geneva Conventions preceded UNCLOS as the first codification of the law of the sea.
• Straits used for international navigation attract a "transit passage" regime, distinct from "innocent passage."
• The Strait of Hormuz carries roughly one-fifth of global oil trade and nearly one-third of traded fertilizers [3].
• India ratified UNCLOS in 1995.
• UNCLOS deep seabed area beyond national jurisdiction is termed "the Area," managed by the International Seabed Authority (ISA).
• The IMO, not the UNSC alone, is the technical UN body for maritime navigation safety [2].
• A May 2026 UNSC resolution on Strait of Hormuz navigation safety, proposed by Bahrain, failed due to Russia-China votes [3].

8. Mains Relevance

• GS-II: International relations — UN bodies (UNSC, IMO), international law/treaties affecting India's interests.
• GS-III: Maritime/energy security, India's economic interests linked to sea lanes of communication (SLOCs).
• Possible question stems: 1. "Discuss the UNCLOS framework governing high seas and straits used for international navigation. How does the 2026 Strait of Hormuz crisis test this framework?" (GS-II/III) 2. "Examine the tension between coastal state sovereignty and freedom of navigation on the high seas, with reference to recent Gulf chokepoint disputes." (GS-II) 3. "Analyse the significance of maritime chokepoints for India's energy security and evaluate India's legal position on freedom of navigation." (GS-III)

9. Related Topics to Study Next

• India's maritime boundary disputes and EEZ claims — direct application of UNCLOS zones.
• South China Sea dispute & UNCLOS Annex VII arbitration (Philippines v. China, 2016) — precedent on transit/sovereignty tensions.
• International Seabed Authority and deep-sea mining rules — governance of "the Area."
• IMO and global shipping safety governance — institutional response mechanism seen in this crisis.
• India's energy security and Gulf dependence — economic stakes behind the Hormuz episode.
• UNSC veto power and reform debates — explains why the Bahrain resolution failed.
• Piracy and maritime security law (UNCLOS Article 100-107) — related high-seas enforcement issues.
• SAGAR doctrine and India's Indo-Pacific maritime strategy — India's own maritime security posture.

10. Common Errors / Trap Areas

• Confusing "innocent passage" (territorial sea) with "transit passage" (straits used for international navigation) — different legal thresholds for restriction.
• Assuming the UN itself enforces UNCLOS — enforcement is via flag-state jurisdiction, ITLOS/ICJ arbitration, or ad hoc coalitions, not a standing UN force.
• Mixing up zone limits: territorial sea (12 nm) vs contiguous zone (24 nm) vs EEZ (200 nm) — a classic Prelims distractor.
• Assuming the U.S. is a UNCLOS party — the U.S. has signed but never ratified UNCLOS, relevant when analysing legality of U.S. high-seas seizures.
• Treating this as a "static-only" topic — the Hormuz crisis shows examiners can graft breaking news onto core UNCLOS provisions.