Territorial Waters vs Exclusive Economic Zone

Two lines drawn parallel to every coastline divide the ocean into legal worlds that look similar from a ship's deck and are profoundly different in law. The first sits twelve nautical miles out and marks the edge of a country's territory. The second sits two hundred nautical miles out and marks the edge of its economic reach. Cross the first and you leave a nation's soil, in every meaningful legal sense. Cross the second and you leave only its resource rights. The distinction between territorial waters and the exclusive economic zone is the single most important concept in the law of the sea, and it is the source of most of the maritime disputes making headlines today. Here is how the two compare, feature by feature.

 

Extent

 

Territorial waters extend up to twelve nautical miles from a country's coastal baseline, which is normally the low-water line along the shore. The exclusive economic zone extends up to two hundred nautical miles from that same baseline, and it includes the territorial sea within it rather than beginning where the territorial sea ends.

Both figures were settled by the 1982 United Nations Convention on the Law of the Sea after decades of argument. Neither was obvious. Territorial seas had historically been tied to the range of a shore-based cannon, giving a customary three-mile limit, and by the mid-twentieth century states were claiming anything from three miles to two hundred. The two hundred mile EEZ was even more contentious, since it was pushed by developing coastal states seeking control over the fisheries off their shores against the resistance of established maritime powers. The compromise that emerged, full sovereignty over a narrow belt and resource rights over a wide one, is the architecture of modern ocean governance.

 

Sovereignty

 

Within its territorial sea, a state has sovereignty. The legal position is essentially the same as on dry land, extending to the water itself, the seabed and subsoil beneath it, and the airspace above it. The country's criminal and civil law applies, its police and navy enforce, and its courts have jurisdiction.

Within its EEZ, a state has sovereign rights rather than sovereignty, and the difference between those two phrases carries enormous weight. Sovereign rights are specific, functional, and limited to defined purposes, principally the exploration and exploitation of resources. They are not general authority over everything that happens in the water. The EEZ is not national territory; it is a zone in which one state holds particular rights and all other states retain particular freedoms, simultaneously. Nearly every EEZ dispute in the world turns on exactly where the boundary between those two sets of entitlements lies.

 

Main Rights

 

In territorial waters, the coastal state controls navigation, security, customs, immigration, pollution, fishing, and the application of its laws generally. Its authority is comprehensive, subject only to the navigational right discussed below.

In the EEZ, the coastal state holds exclusive rights to explore, exploit, conserve, and manage the natural resources of the water column, the seabed, and the subsoil. It also has jurisdiction over the construction and use of artificial islands and installations, over marine scientific research, and over the protection and preservation of the marine environment. What it does not have is general legislative authority. A coastal state cannot simply apply all of its domestic law two hundred miles out, because the EEZ is a functional zone rather than a territorial one, and the list of what falls within its jurisdiction is closed rather than open-ended.

 

Resources

 

Both zones give the coastal state control over marine resources, which is why the resource question is often the least contentious part of the comparison. Within the territorial sea, resource control follows automatically from sovereignty.

Within the EEZ, resource rights are the entire point of the zone's existence, and they cover living resources such as fish, non-living resources including oil, gas, and seabed minerals, and, increasingly significantly, energy produced from the water, currents, and wind. That last category has grown enormously in importance since 1982, because offshore wind development takes place almost entirely within EEZs and the convention's drafters had the foresight to include energy generation from natural forces alongside more traditional extraction. The creation of the EEZ was one of the largest peaceful transfers of resource control in history, bringing the overwhelming majority of the world's commercially exploited fisheries and offshore hydrocarbons under national jurisdiction and, in the process, handing enormous ocean estates to small island states whose land areas are negligible.

 

Foreign Ships

 

In territorial waters, foreign vessels enjoy the right of innocent passage. They may transit through, provided the passage is continuous and expeditious and not prejudicial to the peace, good order, or security of the coastal state. Activities that void innocent passage are specified in the convention and include weapons exercises, intelligence gathering, launching aircraft, fishing, and serious pollution. The right is real but conditional, and the coastal state may enforce its laws against a vessel that abuses it.

In the EEZ, other states retain the high seas freedoms of navigation and overflight, along with the freedom to lay submarine cables and pipelines. These are not permissions granted by the coastal state but freedoms preserved for everyone, which is why a foreign warship may sail through another country's EEZ without asking. What such a vessel may not do is fish, drill, or exploit resources. The practical result is that a ship transiting an EEZ is subject to far fewer constraints than one passing through territorial waters, even though it may be only a few miles further out.

 

Airspace

 

Sovereignty over territorial waters extends upward, so a state controls the airspace above its territorial sea exactly as it controls the airspace above its land. Foreign aircraft have no right of innocent passage equivalent to that enjoyed by ships, and overflight requires permission.

Above the EEZ there is no such sovereignty. Freedom of overflight applies, and foreign aircraft, including military aircraft, may fly there without consent. This asymmetry between the sea surface and the air above it is one of the less intuitive features of the system, and it explains why aerial surveillance flights over other countries' EEZs are lawful under the convention while the same aircraft crossing the twelve mile line would be violating sovereign airspace.

 

Example

 

India illustrates both regimes clearly, and also the friction between them. Its maritime zones are set out in the Territorial Waters, Continental Shelf, Exclusive Economic Zone and Other Maritime Zones Act of 1976, legislation passed before UNCLOS was even concluded, which fixed India's territorial sea at twelve nautical miles and its EEZ at two hundred. The resulting EEZ covers roughly two million square kilometres across the Arabian Sea, the Bay of Bengal, and the waters around the Andaman and Nicobar and Lakshadweep island groups, making it one of the largest in the world. Within it, India regulates fishing, licenses offshore energy projects, and authorises marine scientific research and the construction of installations. Within its territorial sea, a foreign vessel must comply with Indian law subject to innocent passage.

India's case also demonstrates the sharpest live disagreement in EEZ law, namely whether foreign states may conduct military activities there. When India ratified UNCLOS in 1995, it appended a declaration stating its understanding that the convention does not authorise other states to carry out military exercises or manoeuvres in its EEZ or on its continental shelf, particularly those involving weapons or explosives, without the coastal state's consent. Its 1976 Act separately requires foreign warships to give prior notice before passing through Indian territorial waters. The United States takes the opposite position, holding that military activities in an EEZ fall within the preserved freedom of navigation, and it has conducted freedom of navigation operations against Indian claims for decades, including a publicly announced transit by the destroyer USS John Paul Jones roughly 130 nautical miles west of the Lakshadweep Islands in April 2021, which prompted a formal Indian protest. A number of other states, including China, Brazil, and Malaysia, take positions closer to India's. The convention itself is genuinely ambiguous on the point, which is precisely why the dispute persists.

 

The Key Difference

 

The cleanest way to hold the distinction is this. Territorial waters are national territory that happens to be wet, where the coastal state's authority is general and other states have one narrow right of passage. The exclusive economic zone is international water in which one state holds specific economic rights, and where other states retain broad freedoms. One is about sovereignty with an exception carved out; the other is about freedom with specific rights carved out.

That inversion is what makes the EEZ such a persistent source of tension. It was designed as a compromise, deliberately allocating different bundles of rights to different parties in the same body of water, and compromises of that kind work only so long as everyone agrees where one bundle ends and the next begins. As offshore wind farms, subsea cables, seabed minerals, shifting fish stocks, and naval competition all press further from shore, the pressure on that boundary is increasing rather than easing. The twelve mile line is rarely disputed. Almost everything contentious in the modern law of the sea happens in the 188 miles beyond it.

 

Note: This article reflects the law of the sea as established by the 1982 United Nations Convention on the Law of the Sea and as of mid-2026, drawing on sources including the United Nations, India's Territorial Waters, Continental Shelf, Exclusive Economic Zone and Other Maritime Zones Act 1976, and academic commentary. The legality of foreign military activities within an EEZ remains genuinely contested among states, and this article describes the competing positions rather than endorsing either.