International Convention · UN · 1982 (in force 1994)
UNCLOS 1982 — Visual Guide🚧 Under development
Capt Mohab is still refining this section — content will evolve.
The "constitution of the oceans" in one place — coastal-State rights and duties across every maritime zone, the conditions for innocent passage, and the 400-year-old idea that still underpins it: Hugo Grotius's freedom of the seas.
UNCLOS 1982 — the constitution of the oceans. Adopted in 1982, in force since 1994.
Mare Liberum — Hugo Grotius and the freedom of the seas
In Mare Liberum (1609), Dutch jurist Hugo Grotius argued that the sea is international territory and that all nations are free to use it for navigation and trade. The sea, he wrote, cannot be appropriated like land because it is inexhaustible and indispensable to communication between peoples.
That principle — freedom of the seas — became the bedrock of customary international maritime law and is codified four centuries later in UNCLOS 1982 as the freedoms of navigation, overflight, fishing, cable-laying and scientific research (Arts. 87 & 90). The modern compromise: coastal States get layered rights near shore; ships keep core freedoms everywhere else.
Adopted at Montego Bay on 10 December 1982, in force 16 November 1994. 320 articles + 9 annexes. Establishes the maritime zones, codifies navigational rights, allocates resources, protects the marine environment (Part XII), regulates marine scientific researchand creates three institutions: ITLOS, the ISA and the CLCS.
Maritime zones — click a band
Territorial sea
Up to 12 nm from baseline · Arts. 2–3, 17–32, 38- Sovereignty over water, seabed & airspace
- Regulate navigation, fishing, pollution
- Enforce customs/immigration
- Right of INNOCENT PASSAGE for all ships
- Transit passage in straits used for international navigation (Art. 38)
- Submarines must navigate surfaced & show flag (Art. 20)
Innocent passage — the conditions
Articles 17–19 grant ships of all States — coastal or land-locked — the right of innocent passage through the territorial sea. Passage must be continuous and expeditious, may include stopping only for ordinary navigation, force majeure, distress, or rendering assistance.
- • Not prejudicial to peace, good order or security of the coastal State (Art. 19(1))
- • Continuous and expeditious (Art. 18(2))
- • Conducted in conformity with UNCLOS and other rules of international law
- • Submarines navigate on the surface and show their flag (Art. 20)
- • Complies with coastal-State laws on safety of navigation, marine pollution, fisheries, customs (Art. 21)
- Threat or use of force — Against sovereignty, territorial integrity or political independence of the coastal State (Art. 19(2)(a))
- Weapons exercises — Any practice with weapons of any kind
- Intelligence collection — Acts aimed at gathering information prejudicial to defence or security
- Propaganda — Acts of propaganda affecting defence/security of the coastal State
- Launching aircraft/military device — Launching, landing or taking on board any aircraft or military device
- Loading/unloading contrary to law — Goods, currency or persons contrary to customs, fiscal, immigration or sanitary laws
- Wilful & serious pollution — Contrary to UNCLOS Part XII
- Fishing activities — Any fishing operations
- Research or survey activities — Without coastal-State authorisation
- Interference with comms/installations — Aimed at coastal-State systems or installations
- Any other activity not having a direct bearing on passage — Catch-all clause (Art. 19(2)(l))
Self-test — 10 questions
1. What is the maximum breadth of the territorial sea?
2. In which zone does a coastal State enforce customs and immigration laws but lacks full sovereignty?
3. Innocent passage requires passage to be…
4. Submarines exercising innocent passage must…
5. Which book by Hugo Grotius (1609) seeded the 'freedom of the seas' doctrine?
6. The EEZ extends up to…
7. On the high seas, which jurisdiction primarily applies?
8. Piracy on the high seas is subject to…
9. Wilful and serious pollution during transit makes passage…
10. The seabed beyond national jurisdiction (the 'Area') is the…