The Law of the Sea is the body of international law, formalized in the UN Convention on the Law of the Sea (UNCLOS), that defines maritime zones such as the 12-nautical-mile territorial sea and the 200-nautical-mile Exclusive Economic Zone, setting nations' rights over ocean space and resources.
The Law of the Sea is international law for the oceans. Its modern version is the United Nations Convention on the Law of the Sea (UNCLOS), which answers a question land-based boundary rules can't: where does a country's power stop once the coastline ends?
UNCLOS draws a series of zones moving outward from the shore. The territorial sea extends up to 12 nautical miles, and within it a state has full sovereignty, almost as if it were land. Beyond that sits the contiguous zone (out to 24 nautical miles), where a state can enforce customs and immigration laws. The big one is the Exclusive Economic Zone (EEZ), stretching 200 nautical miles, where a state controls resources like fish, oil, and natural gas but does not have full sovereignty. Continental shelf rules can extend resource claims even farther. Think of it as bid-rent for the ocean. The closer the water is to your coast, the more rights you get, and those rights thin out as you move toward the open sea, which belongs to everyone.
This term lives in Topic 4.5 (The Function of Political Boundaries) in Unit 4 and supports learning objective 4.5.A, explaining the nature and function of international boundaries. The CED specifically calls out UNCLOS as essential knowledge, so it's not optional trivia. It also connects directly to EK IMP-4.B.3, which says maritime boundaries and international agreements can encourage or discourage interaction and spark resource disputes. Maritime boundaries are where the abstract idea of sovereignty meets billion-dollar fishing and drilling rights, which is exactly why places like the South China Sea show up on the exam as boundary-dispute examples.
Keep studying AP Human Geography Unit 4
Exclusive Economic Zone (EEZ) (Unit 4)
The EEZ is the Law of the Sea's most exam-relevant creation. UNCLOS is the rulebook, and the 200-nautical-mile EEZ is the rule everyone fights over, because it hands coastal states control of fish, oil, and gas across huge stretches of ocean.
Territorial Waters (Unit 4)
UNCLOS caps the territorial sea at 12 nautical miles. Inside that line a country is fully sovereign, just like on land. Knowing the 12 versus 200 distinction is one of the easiest MCQ points in Unit 4.
Allocational Disputes (Unit 4)
When overlapping EEZ claims collide over resources, you get an allocational boundary dispute. The South China Sea is the textbook case, with multiple nations claiming the same waters for fishing and energy reserves.
Berlin Conference (Unit 4)
Both are examples of boundaries created by international agreement rather than by culture or terrain. The Berlin Conference carved up African land in 1884-1885; UNCLOS carves up ocean space, but through a multilateral UN process instead of imperial bargaining.
On multiple-choice questions, the Law of the Sea shows up in stems about UNCLOS and maritime boundaries. Expect questions asking the maximum extent of the territorial sea (12 nautical miles), why coastal nations push to maximize their EEZ (resource control), and what real-world conflicts like the South China Sea disputes illustrate (overlapping maritime claims and allocational disputes). No released FRQ has asked about the Law of the Sea by name, but it pairs naturally with FRQ prompts on boundary functions and supranational organizations, like the 2025 SAQ on the EU and ASEAN, since UNCLOS is itself a UN agreement member states sign onto. Your job is to define the zones accurately, explain why states want bigger maritime claims, and attach a concrete example.
Don't use these interchangeably. The Law of the Sea (UNCLOS) is the entire legal framework; the EEZ is just one zone that framework creates. Also watch the sovereignty trap. In the 12-nautical-mile territorial sea, a state has full sovereignty. In the 200-nautical-mile EEZ, it only has rights to resources. Foreign ships can still sail through an EEZ freely.
The Law of the Sea, codified in UNCLOS, is the UN framework that defines maritime zones and is named directly in the AP Human Geography CED under Topic 4.5.
The territorial sea extends a maximum of 12 nautical miles from the coast, and within it a state has full sovereignty.
The Exclusive Economic Zone extends 200 nautical miles and gives a state control over resources like fish and oil, but not full sovereignty.
Coastal nations try to maximize their EEZs because bigger zones mean more fishing grounds and energy reserves under their control.
Overlapping maritime claims, like those in the South China Sea, create allocational disputes that UNCLOS struggles to resolve.
It's the body of international law, formalized in the UN Convention on the Law of the Sea (UNCLOS), that defines maritime zones like the 12-nautical-mile territorial sea and the 200-nautical-mile EEZ. It appears in Topic 4.5 as a key example of how international agreements shape boundaries.
Essentially yes for AP purposes. UNCLOS (the United Nations Convention on the Law of the Sea) is the treaty that codified the Law of the Sea, and the exam uses the two names interchangeably.
No. In its 200-nautical-mile EEZ a state has exclusive rights to resources like fish, oil, and gas, but it does not have full sovereignty there. Foreign ships and planes can pass through freely. Full sovereignty only applies in the 12-nautical-mile territorial sea.
Territorial waters extend 12 nautical miles and come with full sovereignty, like an extension of the country's land. The EEZ extends 200 nautical miles and grants only economic rights to resources. The exam loves testing this 12-versus-200 distinction.
Multiple countries claim overlapping EEZs and islands there, all trying to control the same fishing grounds and energy reserves. It shows the main weakness of UNCLOS, which is that the rules exist but enforcement is hard when powerful states' claims overlap.