Common Heritage of Mankind

Introduction

The Common Heritage of Mankind is a principle of international law under which certain areas and resources are regarded as belonging to the international community as a whole rather than being subject to unilateral national appropriation.

In the law of the sea, the principle is most clearly expressed in relation to the Area—the seabed, ocean floor and subsoil beyond the limits of national jurisdiction.

Article 136 UNCLOS

Article 136 provides:

“The Area and its resources are the common heritage of mankind.”

This principle is developed primarily through Part XI of UNCLOS, together with the 1994 Agreement relating to the Implementation of Part XI.

Meaning of Common Heritage of Mankind

The phrase Common Heritage of Mankind (CHM) reflects the idea that certain resources should be managed for the benefit of humanity as a whole.

In the context of the deep seabed, it means that:

• no State can claim sovereignty over the Area;
• no State can appropriate its resources;
• activities must be conducted under an international legal framework;
• benefits from exploitation are to be shared according to the applicable regime;
• the Area must be used for peaceful purposes;
• developing States are to receive particular consideration;
• the marine environment must be protected.

Core Formula

Area

↓

Common Heritage of Mankind

↓

No National Appropriation

↓

International Regulation

↓

Benefit of Mankind

Legal Basis

The main provisions are found in Part XI of UNCLOS.

Important provisions include:

• Article 136 → Common heritage of mankind
• Article 137 → Legal status and non-appropriation
• Article 138 → General conduct of States
• Article 139 → Responsibility for compliance
• Article 140 → Benefit of mankind
• Article 141 → Peaceful purposes
• Article 142 → Rights and interests of coastal States
• Article 143 → Marine scientific research
• Article 144 → Transfer of technology
• Article 145 → Protection of the marine environment
• Article 148 → Participation of developing States
• Article 149 → Archaeological and historical objects
• Article 153 → System of exploration and exploitation

Article 136 – The Foundation

Article 136 is the central provision.

It declares:

The Area + Its Resources = Common Heritage of Mankind

The principle applies to both:

• the Area itself;
• its resources.

However, the legal consequences concerning sovereignty and appropriation are developed particularly by Article 137.

Article 137 – No Appropriation

Article 137 is crucial to understanding CHM.

No State may claim or exercise:

• sovereignty;
• sovereign rights

over any part of the Area or its resources.

Similarly, no State, natural person or juridical person may appropriate any part of the Area.

Therefore:

Discovery ≠ Ownership

A State or company cannot say:

“We discovered this mineral deposit, therefore it belongs to us.”

The resources remain governed by the international regime.

The Area Does Not Belong to the United Nations

A common misconception is that the Area is the property of the UN.

That is incorrect.

The Area is not the territorial property of the United Nations.

Rather, it is subject to the international legal regime created by:

• UNCLOS;
• the International Seabed Authority;
• the applicable implementing instruments.

International Seabed Authority

The International Seabed Authority (ISA) is the central institution established under Part XI.

Its role is to:

• organise activities in the Area;
• control activities in the Area;
• regulate exploration and exploitation;
• approve plans of work;
• develop rules and regulations;
• protect the marine environment.

Core Principle

ISA Regulates; It Does Not Exercise Territorial Sovereignty

The ISA is not a sovereign State and does not own the Area as national territory.

Benefit of Mankind

Article 140

Activities in the Area must be carried out for the:

Benefit of mankind as a whole

This is one of the most important consequences of the common-heritage principle.

The benefits are not intended exclusively for:

• technologically advanced States;
• States sponsoring mining companies;
• States closest to the resources.

The regime is intended to operate for mankind as a whole.

Equitable Sharing of Benefits

Article 140 also provides for the:

Equitable sharing of financial and other economic benefits

derived from activities in the Area.

The detailed arrangements are implemented through the ISA framework.

Therefore:

Resource Extraction

↓

International Regulation

↓

Economic Benefits

↓

Benefit of Mankind as a Whole

Developing States

The CHM principle has an important developmental dimension.

Article 148

Developing States are to be given special consideration regarding activities in the Area.

This reflects the idea that the deep seabed regime should not become a system in which only technologically advanced States benefit from resources beyond national jurisdiction.

Technology Transfer

Article 144

States and competent international organisations are required to cooperate in promoting:

Transfer of technology and scientific knowledge

relating to activities in the Area.

The objective is to enable broader participation in deep seabed activities.

The original technology-transfer arrangements in Part XI were significantly modified by the 1994 Implementation Agreement.

1994 Implementation Agreement

The original Part XI regime generated substantial disagreement, particularly from developed States.

Concerns included:

• mandatory technology transfer;
• production controls;
• financial obligations;
• decision-making;
• the structure of the Enterprise;
• economic effects on existing mineral producers.

The 1994 Agreement relating to the Implementation of Part XI of UNCLOS modified important aspects of the original regime.

Therefore, the modern legal framework should be understood as:

UNCLOS Part XI + 1994 Implementation Agreement

Peaceful Purposes

Article 141

The Area is open to use exclusively for:

Peaceful purposes

The CHM principle therefore operates together with the broader international principle of peaceful use of the oceans.

Environmental Protection

Common heritage does not mean:

“Everyone is free to exploit the resources.”

Exploitation must occur within an environmental framework.

Article 145

UNCLOS requires appropriate measures for the effective protection of the marine environment from harmful effects arising from activities in the Area.

This includes concerns regarding:

• marine ecosystems;
• biodiversity;
• pollution;
• seabed disturbance;
• sediment plumes;
• ecological damage.

Environmental Protection and Future Generations

The CHM principle has an important intergenerational dimension.

Resources are not treated simply as an opportunity for present States and companies to exploit without regard to:

• environmental consequences;
• future generations;
• long-term scientific interests.

Marine Scientific Research

Article 143

Marine scientific research in the Area must be carried out:

• for the benefit of mankind as a whole;
• for peaceful purposes.

States and competent international organisations are encouraged to cooperate in:

• scientific research;
• exchange of information;
• dissemination of knowledge.

Archaeological and Historical Objects

Article 149

Archaeological and historical objects found in the Area must be preserved or disposed of for the benefit of mankind as a whole.

Particular attention is given to the rights and interests of States having cultural, historical or archaeological connections with such objects.

Rights of Coastal States

The CHM principle does not operate in complete isolation from coastal-State rights.

Article 142

Activities in the Area must take into account the rights and legitimate interests of coastal States where activities may affect:

• resources;
• coastal areas;
• other maritime activities.

Therefore:

Common Heritage ≠ Ignoring Coastal States

Common Heritage and Deep-Seabed Mining

Deep-seabed mining is the most important practical context in which the CHM principle operates.

The process can broadly be represented as:

Prospecting

↓

Exploration

↓

Exploitation

All within the applicable UNCLOS/ISA framework.

Prospecting

Prospecting involves searching for mineral resources and identifying potentially valuable deposits.

It does not by itself create sovereign ownership over the area or the resources.

Exploration

Exploration involves detailed investigation of mineral deposits, including:

• geological surveys;
• sampling;
• environmental studies;
• resource assessment.

Exploitation

Exploitation involves the actual recovery of mineral resources from the seabed.

It is subject to the international regulatory framework and approved plans of work.

Mineral Resources

Article 133 includes mineral resources found in situ in the Area.

Important categories include:

Polymetallic Nodules

Often containing:

• manganese;
• nickel;
• cobalt;
• copper.

Polymetallic Sulphides

Associated with hydrothermal vent systems.

Cobalt-Rich Ferromanganese Crusts

Potential sources of cobalt and other minerals.

Common Heritage and Private Companies

A private corporation does not obtain ownership of the Area merely because it participates in seabed mining.

Its activities must occur within the applicable international legal regime.

The international system therefore prevents:

Private Appropriation Through Commercial Activity

Sponsoring States

Entities undertaking activities in the Area may operate through the sponsorship system.

The sponsoring State has important obligations concerning:

• supervision;
• compliance;
• environmental protection;
• due diligence.

2011 Sponsoring States Advisory Opinion

Responsibilities and Obligations of States Sponsoring Persons and Entities with Respect to Activities in the Area

The Seabed Disputes Chamber of ITLOS issued its advisory opinion in 2011.

The opinion is important for understanding:

• due diligence;
• sponsoring-State responsibility;
• environmental protection;
• precaution;
• compliance with ISA regulations.

Due Diligence

A sponsoring State does not automatically become liable for every action of a contractor.

However, it must exercise appropriate:

Due diligence

to ensure that activities comply with the applicable international regime.

The standard of due diligence is influenced by:

• the level of environmental risk;
• available scientific knowledge;
• applicable regulations;
• the circumstances of the activity.

Common Heritage vs Res Communis

These concepts should not be treated as identical.

Res Communis

The concept generally refers to things that are not subject to national appropriation and may be used by States under applicable international law.

Common Heritage of Mankind

The CHM principle goes further by establishing a special international regime involving:

• non-appropriation;
• international management;
• benefit sharing;
• peaceful use;
• environmental protection;
• participation of developing States.

Therefore:

Common Heritage ≠ Simply Open Access

Common Heritage vs Freedom of the High Seas

Another important distinction is between:

High Seas

Governed primarily by the principle of:

Freedom

The Area

Governed by:

Common Heritage

The high seas are open to navigation and other recognised freedoms.

The Area’s mineral resources, however, cannot be freely appropriated.

Comparison

Common Heritage of Mankind	Freedom of the High Seas
Applies to the Area and its resources	Applies to high-seas areas
Part XI	Part VII
International regulation	High-seas freedoms
No appropriation	No sovereignty
ISA regulatory system	Primarily flag-State system
Benefit of mankind	Freedom of use under international law

Common Heritage vs Continental Shelf

This distinction is extremely important.

Continental Shelf

A coastal State has:

Sovereign rights

over its continental shelf resources.

The Area

No State has:

Sovereignty or sovereign rights

over the Area or its resources.

Therefore:

Continental Shelf → Coastal-State Rights

The Area → Common Heritage

Common Heritage vs EEZ

EEZ	Area
Part V UNCLOS	Part XI UNCLOS
Coastal-State sovereign rights	No State sovereignty
Up to 200 nm generally	Beyond national jurisdiction
Coastal State controls specified resources	ISA regulates mineral activities
Resources belong to coastal State under UNCLOS	Resources governed as common heritage

Common Heritage and the 200-Nautical-Mile Rule

A frequent mistake is:

“Everything beyond 200 nautical miles is common heritage.”

This is incorrect.

A coastal State may have a continental shelf extending beyond 200 nautical miles under Article 76.

Therefore:

Beyond 200 nm ≠ Automatically Common Heritage

The Area begins only where the seabed and subsoil lie beyond national jurisdiction.

Common Heritage and Extended Continental Shelf

This creates an important geographical distinction.

Extended Continental Shelf

→ National jurisdiction

The Area

→ Beyond national jurisdiction

Therefore, the same ocean region can contain:

• high seas above;
• national continental shelf below.

The water column and seabed can have different legal statuses.

Common Heritage and High Seas

The high seas concern primarily the water column.

The Area concerns the seabed and subsoil.

Therefore:

Water Column → High Seas

Seabed/Subsoil Beyond National Jurisdiction → Area

Main Principles of Common Heritage

Non-Appropriation

No State or private entity may appropriate the Area or its resources.

International Management

Activities are regulated through the international institutional framework.

Benefit Sharing

Economic benefits are intended to be shared equitably.

Peaceful Use

Activities must be conducted for peaceful purposes.

Environmental Protection

The marine environment must be protected.

Participation of Developing States

Developing States receive special consideration.

Scientific Cooperation

Research and technology cooperation are encouraged.

Is Common Heritage a Principle of Customary International Law?

This question requires care.

The common heritage of mankind principle is expressly established in UNCLOS Article 136 for the Area and its resources.

Its broader status as a universally applicable customary rule outside the specific treaty framework is more debated.

Therefore, for examination purposes, the safest formulation is:

Article 136 establishes the CHM principle within the UNCLOS regime governing the Area.

Do not automatically state that every aspect of CHM has become universally binding customary international law.

Common Heritage and International Equity

The principle reflects concerns about:

• fairness;
• equal opportunity;
• developing-State participation;
• distribution of benefits;
• preventing unilateral appropriation.

It therefore has both:

Legal

and

Institutional

dimensions.

Common Heritage and Future Generations

The concept is often associated with intergenerational interests because resources of the deep seabed are treated as resources that should not be appropriated solely for the benefit of the present generation or a small group of States.

This reinforces the importance of:

• sustainable management;
• environmental protection;
• scientific assessment.

Important Institutional Structure

UNCLOS

↓

Establishes legal framework

↓

Part XI

↓

Establishes Area regime

↓

International Seabed Authority

↓

Organises and controls activities

↓

Contractors

↓

Prospecting / Exploration / Exploitation

↓

Benefits

↓

Mankind as a Whole

Common Examination Mistakes

Mistake 1: Common Heritage Means Everyone Owns the Area

Incorrect.

It means the Area and its resources are governed for the benefit of mankind as a whole under the international legal regime.

Mistake 2: The Area Belongs to the UN

Incorrect.

The Area is not UN territory.

Mistake 3: ISA Owns the Area

Incorrect.

ISA administers and regulates activities; it does not possess territorial sovereignty over the Area.

Mistake 4: Any State Can Mine the Area

Incorrect.

Activities must comply with the UNCLOS/ISA system.

Mistake 5: First Discovery Creates Ownership

Incorrect.

Article 137 prohibits appropriation.

Mistake 6: Common Heritage Means Free Access

Incorrect.

It means regulated access under an international system.

Mistake 7: Everything Beyond 200 nm Is Common Heritage

Incorrect.

An extended continental shelf may exist beyond 200 nm.

Mistake 8: Common Heritage Applies to the Entire High Seas

Incorrect.

The CHM principle specifically concerns the Area and its resources under UNCLOS.

Mistake 9: Coastal States Have No Relevant Rights

Incorrect.

Article 142 requires respect for coastal States’ rights and legitimate interests.

Mistake 10: Sponsoring State Is Automatically Liable

Incorrect.

The 2011 Advisory Opinion emphasises due diligence rather than automatic liability.

Quick Revision

• CHM = Common Heritage of Mankind.
• Main legal basis → Article 136 UNCLOS.
• Applies to:
  • the Area;
  • resources of the Area.
• The Area = seabed, ocean floor and subsoil beyond national jurisdiction.
• Article 136 → Common Heritage.
• Article 137 → No Sovereignty / No Appropriation.
• Article 140 → Benefit of Mankind.
• Article 141 → Peaceful Purposes.
• Article 143 → Scientific Research.
• Article 144 → Technology Transfer.
• Article 145 → Marine Environment.
• Article 148 → Developing States.
• Article 149 → Archaeological/Historical Objects.
• Article 153 → Activities in the Area.
• ISA → organ that organises and controls activities in the Area.
• ISA ≠ sovereign owner.
• Resources include:
  • polymetallic nodules;
  • polymetallic sulphides;
  • cobalt-rich ferromanganese crusts.
• No State can appropriate Area resources.
• Private companies cannot acquire ownership merely through discovery.
• Activities include:
  • prospecting;
  • exploration;
  • exploitation.
• Benefit → mankind as a whole.
• Equitable sharing → Article 140.
• Developing States → special consideration.
• Environmental protection → Article 145.
• Sponsoring States → due diligence.
• 2011 Advisory Opinion → Sponsoring States and due diligence.
• 1994 Implementation Agreement modified the original Part XI regime.
• Common Heritage ≠ res communis.
• Common Heritage ≠ freedom of high seas.
• Common Heritage ≠ continental shelf.
• Common Heritage ≠ EEZ.
• Beyond 200 nm ≠ automatically Area.
• Central principle:

Common Heritage = No Appropriation + International Regulation + Benefit of Mankind

One-Line Memory Trick

“136 – 137 – 140 – 145 – ISA”

136 → Common Heritage

137 → No Appropriation

140 → Benefit of Mankind

145 → Environment

ISA → International Regulation

And:

“No State Owns It; Mankind Benefits.”

Final Formula

Seabed Beyond National Jurisdiction

↓

THE AREA

↓

Article 136

→ Common Heritage of Mankind

↓

Article 137

→ No Sovereignty / No Appropriation

↓

International Seabed Authority

↓

Prospecting

↓

Exploration

↓

Exploitation

↓

Article 140

→ Benefit of Mankind

↓

Article 145

→ Environmental Protection

↓

Equitable and Internationally Regulated Use

Conclusion

The Common Heritage of Mankind is the foundational principle governing the Area under Part XI of UNCLOS.

Under Article 136, the Area and its resources are declared to be the common heritage of mankind. This principle prevents any State, company or individual from treating the deep seabed beyond national jurisdiction as an ordinary resource frontier open to unilateral appropriation.

Its principal consequences are found in Article 137, which prohibits sovereignty and appropriation; Article 140, which requires activities to be conducted for the benefit of mankind as a whole; and Article 145, which requires protection of the marine environment.

The system is administered through the International Seabed Authority, which organises and controls activities in the Area. Deep seabed mineral activities therefore operate within an international system involving prospecting, exploration and exploitation rather than unilateral national ownership.

The principle also incorporates:

• equitable benefit sharing;
• special consideration for developing States;
• scientific cooperation;
• technology transfer;
• peaceful use;
• environmental protection.

The 1994 Implementation Agreement is essential to understanding the modern operation of Part XI because it modified several aspects of the original regime.

The distinction between the Area and other maritime zones is equally important:

High Seas → Freedom

Continental Shelf → Coastal-State Sovereign Rights

EEZ → Coastal-State Sovereign Rights

The Area → Common Heritage of Mankind

And remember:

Beyond 200 nautical miles does not automatically mean the Area.

A coastal State may possess an extended continental shelf beyond 200 nautical miles. The Area begins only beyond the limits of national jurisdiction.

For examinations, remember:

136 – 137 – 140 – 145 – ISA

136 → Common Heritage

137 → No Appropriation

140 → Benefit of Mankind

145 → Environment

ISA → International Regulation

The most important case is the 2011 Seabed Disputes Chamber Advisory Opinion on the Responsibilities and Obligations of States Sponsoring Persons and Entities with Respect to Activities in the Area, particularly for due diligence, environmental protection and sponsoring-State responsibility.

Ultimately:

The Common Heritage of Mankind means that the resources of the deep seabed beyond national jurisdiction cannot be appropriated by individual States or private actors and must be managed through the international legal regime for the benefit of mankind as a whole.