Exclusive Economic Zone (EEZ)

How It Works / What It Means in Practice

An Exclusive Economic Zone (EEZ) is a maritime area that extends up to 200 nautical miles from a coastal state's baseline, typically its shoreline. Within this zone, the coastal state has sovereign rights to explore, exploit, conserve, and manage natural resources—both living (like fish) and non-living (like oil and gas)—in the waters, seabed, and subsoil. However, the EEZ does not grant full sovereignty over the waters as territorial seas do; other states retain freedoms such as navigation, overflight, and laying submarine cables and pipelines.

The concept of the EEZ was formalized under the 1982 United Nations Convention on the Law of the Sea (UNCLOS), which balances coastal states’ rights to resources with the international community’s interest in freedom of navigation and use of the oceans. The EEZ is a zone of jurisdiction rather than absolute sovereignty, meaning the coastal state can regulate economic activities but must respect certain freedoms of other states.

Why It Matters

EEZs are crucial for states because they extend control over valuable marine resources far beyond territorial waters. This extension can significantly impact a nation's economy, especially for those reliant on fishing, offshore oil and gas extraction, and seabed mining. Control over an EEZ allows a state to regulate fishing quotas, protect marine environments, and develop energy resources, directly affecting food security and economic development.

Politically, EEZs can be sources of tension and dispute, especially where zones overlap due to proximity of neighboring states or ambiguous baselines. Managing EEZs effectively is important for maintaining peaceful maritime relations and ensuring sustainable use of ocean resources. They also play a role in national security, as control over a maritime zone involves monitoring activities and preventing unauthorized exploitation.

Exclusive Economic Zone (EEZ) vs Territorial Sea

A common point of confusion is the difference between an EEZ and a territorial sea. While both are maritime zones extending from a state's coast, the territorial sea extends up to 12 nautical miles and is subject to full sovereignty of the coastal state, similar to land territory. In contrast, the EEZ extends up to 200 nautical miles and grants only sovereign rights over resource-related activities, not full sovereignty over the waters.

This means that in the territorial sea, the coastal state can regulate all activities including passage of foreign ships, whereas in the EEZ, other states enjoy freedoms like navigation and overflight, provided they respect the coastal state's resource rights.

Real-World Examples

The South China Sea is a well-known example where overlapping EEZ claims have led to geopolitical tensions among countries like China, the Philippines, Vietnam, and Malaysia. These states assert rights over overlapping maritime zones rich in fisheries and potential oil and gas reserves.

Another example is the United States’ EEZ, which is one of the largest in the world due to its numerous coastlines and overseas territories. The U.S. manages fisheries, offshore drilling, and environmental protections within this zone.

Norway’s management of its EEZ in the North Sea has been critical for its oil and gas industry, significantly contributing to its national wealth.

Common Misconceptions

One misconception is that a country “owns” the water within its EEZ, but in reality, it only has exclusive rights to exploit resources. Other states can still pass through, fly over, and lay cables or pipelines without coastal state permission.

Another misunderstanding is that EEZs automatically solve maritime disputes. In practice, overlapping claims often require diplomatic negotiations, international arbitration, or adjudication to resolve.

Some also confuse EEZ rights with continental shelf rights, which can extend beyond 200 nautical miles under certain geological conditions, granting resource rights over the seabed and subsoil but not the water column.

Understanding these nuances is key to appreciating how EEZs function within international maritime law and global diplomacy.