UNCLOS Maritime Zones, EEZ, Rights, Conferences, Significance

The United Nations Convention on the Law of the Sea (UNCLOS) acts as a global rulebook for oceans, guiding how countries use and manage marine spaces. It divides the seas into different maritime zones, each with specific rights and responsibilities for coastal states. These zones help nations utilize marine resources, ensure environmental protection, and maintain maritime security. UNCLOS Maritime Zones are discussed in detail in this article.

UNCLOS Maritime Zones

• The United Nations Convention on the Law of the Sea (UNCLOS), 1982, often called the “Law of the Sea”, is an international treaty that provides a comprehensive legal framework for the use and governance of the world’s oceans.
• It divides marine areas into distinct maritime zones such as Internal Waters, Territorial Sea, Contiguous Zone, Exclusive Economic Zone (EEZ), and High Seas, each having a different legal status.
• UNCLOS is the only global convention that clearly defines state jurisdiction in maritime spaces, balancing the interests of coastal states and the international community.
• It forms the backbone of offshore governance, regulating activities like navigation, resource exploitation, environmental protection, and maritime security.
• The convention also outlines the rights and responsibilities of states across these five concentric zones, ensuring peaceful and sustainable use of oceans.

Baseline (Starting Point of Maritime Zones)

• The baseline is the low-water line along the coast as officially recognized by a coastal state.
• It serves as the reference line from which all maritime zones like the Territorial Sea, EEZ, and Contiguous Zone are measured.
• Two main types: Normal Baseline (Article 5) and Straight Baseline (Article 7 of UNCLOS).

Internal Waters

• Internal Waters lie on the landward side of the baseline and include areas like bays, ports, rivers, inlets, and coastal lakes connected to the sea.
• The coastal state exercises full sovereignty, similar to its land territory.
• Foreign vessels do not have the right of innocent passage unless specifically permitted.
• The state can regulate entry, navigation, and security, including Port State Control measures.

Territorial Sea (Up to 12 Nautical Miles)

• Extends up to 12 nautical miles (nm) from the baseline (Article 3 of UNCLOS).
• A nautical mile = 1.85 km, based on the Earth’s latitude measurement.
• Coastal states enjoy complete sovereignty over:
  • Water surface
  • Seabed and subsoil
  • Airspace above
• However, this sovereignty is subject to the Right of Innocent Passage, meaning:
  • Foreign ships can pass through as long as it is not harmful to peace, security, or order.
  • Coastal states can temporarily suspend this right for security reasons.

Contiguous Zone (Up to 24 Nautical Miles)

• Extends up to 24 nautical miles from the baseline.
• Acts as a buffer or intermediary zone between the Territorial Sea and High Seas.
• Coastal states do not have full sovereignty but have limited enforcement powers to:
  • Prevent violations of customs, fiscal, immigration, and sanitary laws.
  • Punish offences committed within their territory or territorial waters.
• Jurisdiction is limited mainly to the surface and seabed, not full control over airspace.

Exclusive Economic Zone (EEZ) (Up to 200 Nautical Miles)

• Extends up to 200 nautical miles from the baseline.
• Coastal states have sovereign rights (not full sovereignty) for:
  • Exploration and exploitation of natural resources (living and non-living).
  • Conservation and management of marine resources.
  • Activities like energy generation from water, currents, and wind.
• Important limitation:
  • Other states retain freedom of navigation and overflight.
• Thus, EEZ represents a balance between resource rights of coastal states and global maritime freedoms.

Continental Shelf

• Continental Shelf Refers to the seabed and subsoil beyond the Territorial Sea, forming the natural extension of the landmass.
• Coastal states have exclusive sovereign rights to explore and exploit mineral and non-living resources.
• It does not include water column rights, unlike EEZ.
• Can extend beyond 200 nm in certain geological conditions.

High Seas

• The High Seas lie beyond the EEZ and are outside national jurisdiction.
• Considered the “common heritage of mankind”.
• All states enjoy freedoms such as:
  • Navigation
  • Overflight
  • Fishing (subject to regulations)
  • Marine scientific research
• Activities must be used only for peaceful purposes under international law.

UNCLOS Conferences

• The United Nations Convention on the Law of the Sea (UNCLOS) developed over time through three major international conferences.
• These conferences were organized to create a common legal framework for oceans, as countries had conflicting claims over maritime boundaries and resources.
• The journey from UNCLOS I to UNCLOS III shows how global consensus gradually evolved to form the present Law of the Sea system.

UNCLOS I (1958)

• The first United Nations Conference on the Law of the Sea (UNCLOS I) was held in Geneva, Switzerland, with discussions beginning in 1956 and final agreements adopted in 1958, marking the first global effort to codify international maritime law.
• It resulted in the adoption of four major conventions dealing with the Territorial Sea and Contiguous Zone, High Seas, Continental Shelf, and Fishing & Conservation of Living Resources, thereby laying the initial legal foundation for ocean governance.
• Despite this progress, the conference failed to reach agreement on the standard width of the Territorial Sea, reflecting differences between countries and leaving the framework incomplete and limited in scope.

UNCLOS II (1960)

• The second conference (UNCLOS II) was again held in Geneva in 1960 as a short follow-up meeting to address unresolved issues from UNCLOS I, especially regarding territorial sea limits and fishing rights.
• The conference aimed to create a clear and universally accepted rule on maritime boundaries, but it ultimately failed to produce any new agreements or treaties.
• The failure occurred by a very narrow margin (one vote short of the required majority), highlighting the continued disagreements between coastal states seeking greater control and maritime powers supporting freedom of navigation.

UNCLOS III (1973-1982)

• The third and most significant conference (UNCLOS III) was held from 1973 to 1982 in New York and Geneva, driven by increasing global conflicts over ocean resources, maritime boundaries, and strategic interests.
• This conference successfully produced the comprehensive UNCLOS (1982) treaty, which clearly defined maritime zones such as Territorial Sea, Exclusive Economic Zone (EEZ), and High Seas, and established a complete legal framework for ocean governance.
• It introduced key provisions related to navigation rights, deep seabed mining, marine scientific research, environmental protection, and dispute settlement mechanisms, making it a holistic and modern law of the sea.
• The convention came into force on 16 November 1994, after sufficient ratifications, and also led to the creation of institutions like the International Tribunal for the Law of the Sea (ITLOS), strengthening global maritime dispute resolution.

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Significance of UNCLOS Maritime Zones

• The United Nations Convention on the Law of the Sea (UNCLOS) establishes a uniform and comprehensive legal framework for oceans, bringing clarity to maritime boundaries and significantly reducing conflicts between states over sea areas and resources.
• It ensures a balanced and equitable sharing of marine resources by recognizing the rights of coastal states over nearby waters while also protecting the collective interests of the international community, especially in areas beyond national jurisdiction.
• UNCLOS plays a vital role in supporting global trade and navigation, as it guarantees freedom of navigation and overflight, which is essential for international shipping routes that carry the majority of the world’s trade.
• The convention promotes marine environmental protection by setting rules to prevent pollution, overfishing, and habitat destruction, thereby encouraging the sustainable use of ocean resources for future generations.
• It provides an effective system for peaceful dispute resolution through legal mechanisms and institutions, helping countries settle maritime disagreements such as those in the South China Sea and East China Sea without resorting to conflict.
• UNCLOS also supports marine scientific research and technological development, enabling countries to explore and study ocean resources while maintaining international cooperation and data sharing.