About UNCLOS:
- The United Nations Convention on the Law of the Sea (UNCLOS) is an international treaty that aims to regulate the use of the world's oceans.
- UNCLOS was adopted on December 10, 1982, and came into force on November 16, 1994.
- It aims to protect the environmental protection of the seas, address maritime boundaries, rights to marine resources, and dispute resolution.
- Establishes the International Seabed Authority to regulate mining and related activities on the ocean floor beyond national jurisdiction.
- UNCLOS divides marine areas into five main zones, each with distinct legal status and jurisdictional rights for coastal states.
- It is the only international convention that establishes a comprehensive framework for state jurisdiction in maritime spaces, covering sovereignty, rights, and responsibilities of coastal states and those navigating the oceans.
- The convention plays a critical role in offshore governance by coastal states and regulating activities on the high seas.
- UNCLOS is widely signed and ratified by most coastal countries, but its interpretation remains disputed, especially in regions like the South China Sea and the East China Sea.
Maritime Zones under UNCLOS

- Baseline
- Definition: The low-water line along the coast, recognized by the coastal state, from which the breadth of maritime zones is measured.
- Significance: It is the reference point for measuring the boundaries of different maritime zones.
- Internal Waters
- Definition: Waters on the landward side of the baseline, such as bays, ports, inlets, rivers, and lakes connected to the sea.
- Sovereignty: Coastal states have full sovereignty over their internal waters, similar to their sovereignty over land.
- Innocent Passage: No right of innocent passage through internal waters. The innocent passage refers to the right of foreign vessels to pass through territorial waters as long as it is not prejudicial to the peace, order, or security of the coastal state. Coastal states have the right to suspend this passage if necessary.
- Territorial Sea
- Extent: The territorial sea extends up to 12 nautical miles (nm) from the baseline.
- Nautical Mile: A nautical mile is equivalent to 1.1508 land miles or 1.85 kilometers.
- Sovereignty: The coastal state has sovereignty over its territorial sea, including the seabed, subsoil, and airspace above.
- Innocent Passage: Foreign ships are allowed innocent passage through the territorial sea, meaning they can pass through as long as their activities do not disturb peace or security. However, the coastal state may regulate or restrict such passage for national security or environmental reasons.
- Contiguous Zone
- Extent: The contiguous zone extends up to 24 nm from the baseline.
- Purpose: Acts as a buffer zone between the territorial sea and the high seas.
- Jurisdiction: Coastal states have the right to prevent and punish violations of customs, fiscal, immigration, and sanitary laws within the territorial sea and their territory.
- Limitations: The coastal state's jurisdiction in the contiguous zone is limited to surface and seabed activities. There are no rights over airspace in this zone.
- Exclusive Economic Zone (EEZ)
- Extent: Each coastal state may claim an EEZ up to 200 nm from the baseline, beyond its territorial sea.
- Sovereign Rights: The coastal state has sovereign rights for:
- Exploring, exploiting, conserving, and managing natural resources (living and non-living) of the seabed and subsoil.
- Energy production activities such as the generation of energy from water, currents, and wind.
- Freedom of Navigation: The EEZ does not grant the coastal state rights to limit freedom of navigation or overflight within the zone, except in very specific circumstances.
- Resource Management: While the coastal state has exclusive rights to resources, the EEZ does not affect international shipping or overflights.
- High Seas
- Definition: The areas of the ocean beyond the EEZ are considered the high seas.
- Status: The high seas are regarded as "the common heritage of all mankind" and are beyond the jurisdiction of any one country.
- Usage: States can conduct activities in the high seas as long as they are for peaceful purposes, including transit, marine scientific research, and undersea exploration.
- Legal Status: No single nation has sovereignty over the high seas, and they are open to all states for peaceful activities.
Disputes and Controversies
- Although UNCLOS has been widely ratified, its interpretation remains controversial in some maritime regions, especially:
- South China Sea: Disputes over territorial claims and rights to resources, including the control of maritime zones, among multiple countries (China, the Philippines, Vietnam, etc.).
- East China Sea: A similar dispute exists over territorial waters and island sovereignty, primarily between China and Japan.
Significance of UNCLOS
- Legal Backbone for Maritime Governance: UNCLOS provides a comprehensive framework for managing both coastal and international waters, ensuring that maritime activities are conducted peacefully and sustainably.
- Guidelines for State Jurisdiction: It outlines the rights and responsibilities of coastal states in their maritime zones and also regulates freedom of navigation and marine resource exploitation.
- Conflict Prevention: UNCLOS helps manage maritime disputes by offering legal guidelines on resolving conflicts over territorial waters, marine resources, and navigation rights.
- International Cooperation: UNCLOS promotes global cooperation in protecting marine environments, managing resources, and supporting marine scientific research.
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