Borders, Territory and the Sea

Sovereignty concerns a state's authority to govern its territory. A disagreement over where that territory ends can affect which state's laws and institutions operate in a place.

There is no world government that settles every boundary dispute. International law still applies. States may have duties under treaties, including treaties that establish borders. A government cannot treat its own preferred line as proof that an agreed boundary has changed.

Courts can issue binding judgments when they have jurisdiction over a case. Jurisdiction is legal authority to hear the case. Before describing a court decision, check both its authority and whether the decision is binding.

A binding judgment and compliance with it are different matters. A state may reject a decision or delay carrying it out without cancelling its legal duty. Negotiations and international pressure may affect implementation. Difficulty in obtaining compliance does not make the judgment an optional opinion.

Botswana and Namibia disputed Kasikili/Sedudu Island in the Chobe River. Their arguments about the treaty boundary concerned the meaning of the river's main channel in an 1890 treaty.

Botswana argued that the northern channel was the main channel. Namibia argued for the southern channel. Naming the treaty was therefore only the start of comparing the claims. The court also needed evidence relevant to identifying the main channel.

In its 1999 judgment, the International Court of Justice identified the northern channel as the boundary and found that the island belonged to Botswana. This historical result should not be turned into a rule that every river border follows whichever channel appears on a recent map.

For another dispute, begin again with its own boundary rule and evidence. Record each state's claim separately. Ask what the documents and physical evidence establish, then consider how the proposed lines affect local communities. A consequence for residents and a legal basis for a boundary are related questions, but they are not interchangeable.

A coastal baseline is the starting reference for measuring sea-zone limits. The territorial sea can reach up to 12 nautical miles from that baseline. The coastal state has sovereignty there, subject to passage rights.

The exclusive economic zone, or EEZ, lies beyond the territorial sea and can reach up to 200 nautical miles from the baseline. It gives the coastal state rights over resources such as fish, oil and gas. Other states keep navigation rights. The EEZ does not give ownership of passing ships or full sovereignty over the water. Overlapping entitlements require a boundary settlement.

Offshore features do not all generate the same zones. Under the UN Convention on the Law of the Sea, rocks unable to sustain human habitation or economic life of their own have no EEZ or continental shelf of their own, though they can have a territorial sea. An artificial island generates no sea zones of its own.

An island having no residents today does not establish that the rock exception applies. Check the feature's characteristics before explaining which maritime rights a claim could bring.

A river boundary follows a physical feature. A grid boundary follows a line of latitude or longitude. Neither description tells you by itself how the line affects people.

If a river changes course, distinguish the physical change from the legal boundary. Read the treaty or other boundary rule before deciding whether the border moved. A new map may show where the water now flows without proving that the legal line changed.

A grid line can divide a community or put a resource on one side. A river border can also separate people and affect access to resources. Calling one line natural and another straight does not establish that either has fair consequences.

Compare specific effects. Ask where homes and farmland lie, who can reach a resource and how each proposed boundary would change access. Then keep those findings separate from the evidence establishing the legal line. This connects boundary disputes to the regional environments, resources and daily lives studied earlier.