---
title: "Contiguous Zone — AP Human Geography Definition (UNCLOS)"
description: "The contiguous zone is the UNCLOS maritime band from 12 to 24 nautical miles offshore where states enforce customs, immigration, and pollution laws. Key for Topic 4.5."
canonical: "https://fiveable.me/ap-hug/key-terms/contiguous-zone"
type: "key-term"
subject: "AP Human Geography"
unit: "Unit 4"
---

# Contiguous Zone — AP Human Geography Definition (UNCLOS)

## Definition

The contiguous zone is the UNCLOS maritime zone extending 12 nautical miles beyond a state's territorial sea (so from 12 to 24 nautical miles offshore), where the state can enforce customs, immigration, sanitation, and pollution laws without claiming full sovereignty over the water.

## What It Is

The contiguous zone is one of the maritime boundary zones set up by the [United Nations Convention on the Law of the Sea](/ap-hug/unit-4/function-political-boundaries/study-guide/UPFD3Ofw32vGtr5XYDTk "fv-autolink") (UNCLOS). It runs from the outer edge of the territorial sea (12 nautical miles from shore) out to 24 nautical miles. Inside it, a coastal state doesn't own the water the way it owns its territory, but it gets enforcement power. It can stop ships to enforce its customs, immigration, taxation, and [pollution](/ap-hug/key-terms/pollution "fv-autolink") laws.

Think of it as a buffer of partial control. In the territorial sea, the state has near-full [sovereignty](/ap-hug/unit-4/political-processes/study-guide/9WmdRJEK49Nh0Nu95fLs "fv-autolink"). In the contiguous zone, sovereignty fades to a policing role. Beyond that, the Exclusive Economic Zone (EEZ) gives only resource rights out to 200 nautical miles. UNCLOS basically built a gradient of state power that weakens as you move away from the coast, and the contiguous zone is the middle step.

## Why It Matters

The contiguous zone lives in **Topic 4.5, The Function of Political Boundaries ([Unit 4](/ap-hug/unit-4 "fv-autolink"))**, under learning objective **4.5.A**, which asks you to explain the nature and function of international boundaries. The CED's essential knowledge points out that [maritime boundaries](/ap-hug/key-terms/maritime-boundaries "fv-autolink") and international agreements (like UNCLOS) shape state interactions and resource disputes (EK IMP-4.B.3). The contiguous zone is your evidence that boundaries aren't all-or-nothing. States can hold different *degrees* of sovereignty over different spaces, which is exactly the kind of nuance the exam rewards. It also sets up Topic 4.6 boundary disputes, since overlapping maritime claims are a classic source of allocational conflict.

## Connections

### Territorial Sea (Unit 4)

The territorial sea is the first 12 nautical miles, where a state has nearly full sovereignty. The contiguous zone starts where the territorial sea ends. Knowing the handoff point (12 nm) is the difference between a right and a wrong MCQ answer.

### Exclusive Economic Zone (EEZ) (Unit 4)

The EEZ extends to 200 nautical miles and only grants resource rights (fishing, drilling, mining). The contiguous zone grants law enforcement, not resource ownership. Same UNCLOS framework, totally different powers.

### Sovereignty (Unit 4)

The contiguous zone proves sovereignty can be partial. A state can't claim the water as territory, but it can board a smuggler's ship there. That graded model of control is what UNCLOS contributes to the AP definition of sovereignty.

### [Allocational Disputes (Unit 4)](/ap-hug/key-terms/allocational-disputes)

When maritime zones from neighboring countries overlap, fights break out over who controls [resources](/ap-hug/unit-7/economic-sectors-patterns/study-guide/BpCChSs6EJPBDwTSbHXh "fv-autolink") and enforcement, like in the South China Sea. UNCLOS zones are the legal vocabulary those disputes are argued in.

## On the AP Exam

This term shows up almost entirely as a multiple-choice and stimulus question concept. A very common format gives you a map of a coastline with three bands drawn at 12, 24, and 200 nautical miles and asks you to identify what kind of boundary information is shown (maritime boundaries under UNCLOS) or to match each band to its zone. Practice questions also test whether you know which zone does what, like which one grants exclusive resource rights to 200 nm (that's the EEZ, not the contiguous zone). Your job is simple but precise. Memorize the three distances (12, 24, 200) and the power attached to each zone. No released FRQ has required the term verbatim, but UNCLOS zones make strong evidence in any free-response answer about maritime boundaries, sovereignty, or resource disputes.

## Contiguous Zone vs Territorial Sea

Both are UNCLOS zones measured from the coast, so they blur together fast. The territorial sea (0-12 nautical miles) is treated almost like the state's land territory, with full sovereignty over the water, seabed, and airspace. The contiguous zone (12-24 nautical miles) gives only enforcement power for specific laws like customs and immigration. Quick check for the exam: full sovereignty means territorial sea, law enforcement only means contiguous zone, resource rights only means EEZ.

## Key Takeaways

- The contiguous zone extends from 12 to 24 nautical miles offshore, picking up where the territorial sea ends.
- Within the contiguous zone, a state can enforce customs, immigration, taxation, and pollution laws, but it does not have full sovereignty over the water.
- It is one of the maritime zones defined by UNCLOS, alongside the territorial sea (0-12 nm) and the Exclusive Economic Zone (0-200 nm).
- UNCLOS zones show that sovereignty over the ocean works as a gradient, with state power weakening the farther you get from the coast.
- Overlapping maritime zone claims between neighboring states fuel allocational disputes over resources, a major theme in Topic 4.6.

## FAQs

### What is the contiguous zone in AP Human Geography?

It's the UNCLOS maritime zone running from 12 to 24 nautical miles off a country's coast, where the state can enforce customs, immigration, and pollution laws. It's tested in Unit 4, Topic 4.5 on the function of political boundaries.

### Does a country have full sovereignty in its contiguous zone?

No. Full sovereignty only applies in the territorial sea (the first 12 nautical miles). In the contiguous zone the state gets enforcement power for specific laws, not ownership of the water.

### How is the contiguous zone different from the EEZ?

The contiguous zone (12-24 nm) is about law enforcement, like stopping smuggling or illegal immigration. The EEZ (out to 200 nm) is about resource rights, like fishing and offshore drilling. If an exam question mentions exclusive rights to marine resources, the answer is EEZ, not contiguous zone.

### How far does the contiguous zone extend?

It extends 12 nautical miles beyond the territorial sea, so it covers the band from 12 to 24 nautical miles from the coast. The three numbers to memorize for UNCLOS are 12, 24, and 200.

### Why does the contiguous zone matter for boundary disputes?

Maritime zones can overlap when countries sit close together or claim contested islands, which sparks [allocational disputes](/ap-hug/key-terms/allocational-disputes "fv-autolink") over resources and control. UNCLOS zones like the contiguous zone are the legal framework states use to argue those claims, as in the South China Sea.

## Related Study Guides

- [4.5 The Function of Political Boundaries](/ap-hug/unit-4/function-political-boundaries/study-guide/UPFD3Ofw32vGtr5XYDTk)

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