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Understanding Exclusive Economic Zones and Maritime Boundaries

The Exclusive Economic Zone (EEZ) is a critical concept in international law governing maritime boundaries.

mysimulator teamUpdated June 2026≈ 3 min read▶ Open the simulation

What Are Exclusive Economic Zones?

An Exclusive Economic Zone (EEZ) is a maritime area extending up to 200 nautical miles from a country's baseline, where the coastal state has special rights regarding the exploration and use of marine resources, whether living or non-living.

The EEZ allows for significant economic activities such as fishing, oil and gas extraction, and scientific research, while also providing certain environmental protections.

Key Components of Maritime Boundaries

Under the United Nations Convention on the Law of the Sea (UNCLOS), a coastal state has sovereignty over its territorial sea up to 12 nautical miles from its baseline, and control over a contiguous zone for customs, immigration, and pollution prevention up to another 12 nautical miles.

Beyond these areas lies the EEZ, which extends to 200 nautical miles or to the edge of the continental margin, whichever is further.

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The Role of Article 15 in Maritime Boundaries

Article 15 of UNCLOS provides a method for resolving disputes over maritime boundaries between states with opposite or adjacent coasts.

It suggests using the equidistance principle, which involves drawing lines that equally divide the distance between points on the baselines of both countries to determine their maritime boundary.

Practical Applications and Challenges

Exclusive Economic Zones are crucial for resource management and exploitation, allowing states to regulate activities within a defined area.

However, determining EEZ boundaries can be complex, especially in cases where the equidistance method results in overlapping claims or when dealing with archipelagic states.

Frequently asked questions

Why is the 200-nautical-mile limit important for an EEZ?

The 200-nautical-mile limit allows coastal states to effectively manage and exploit marine resources within a reasonable distance from their shores, ensuring sustainable use of these resources.

How does the equidistance method work in resolving maritime disputes?

The equidistance method involves drawing lines that equally divide the distance between points on the baselines of both countries to determine a fair and balanced maritime boundary, often used when states have overlapping claims.

What happens if two countries cannot agree on their EEZ boundaries?

Disputes over EEZ boundaries are typically resolved through negotiations between the involved states or through international arbitration or adjudication mechanisms provided by UNCLOS.

Can an EEZ extend beyond 200 nautical miles under certain circumstances?

Yes, if a coastal state can prove that its continental shelf extends beyond 200 nautical miles, it may apply to the Commission on the Limits of the Continental Shelf for approval to extend its EEZ further.

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