United States maritime zones

United States maritime zones
Name	United States maritime zones
Caption	Flag of the United States
Established	20th–21st century
Jurisdiction	United States
Treaties	United Nations Convention on the Law of the Sea (partially), Convention on the Territorial Sea and the Contiguous Zone, 1958 Convention on the Continental Shelf

United States maritime zones describe the spatial divisions of ocean territory adjacent to the United States coastline that determine rights over navigation, resources, and enforcement. These zones derive from a mix of domestic statutes, presidential proclamations, executive practice, and international instruments that affect relations with Canada, Mexico, Russia, Cuba, Bahamas, Guatemala, and other coastal states. Federal agencies such as the Department of State, the United States Coast Guard, the National Oceanic and Atmospheric Administration, and the Department of the Interior implement policy across these maritime zones.

Overview

The United States recognizes multiple maritime zones including the territorial sea, the contiguous zone, the exclusive economic zone (EEZ), and rights over the continental shelf, each with distinct legal regimes reflected in presidential proclamations like the Proclamation 2667 and statutes such as the Magnuson–Stevens Fishery Conservation and Management Act. The extent and delimitation of these zones are shaped by bilateral maritime boundary agreements with Canada–United States border, Mexico–United States border, and multilateral arrangements involving the United Nations Conference on the Law of the Sea. Historical disputes—such as fisheries controversies involving the Straits of Juan de Fuca and tensions near the Bering Sea—have influenced the evolution of U.S. practice.

Territorial Sea and Contiguous Zone

The United States asserts a 12-nautical-mile territorial sea under international customary law and proclamations aligned with UNCLOS principles, granting sovereignty similar to that exercised on land. Within this zone, coastal states exercise full sovereignty subject to the right of innocent passage by vessels of other states, a concept invoked in incidents like those near the Black Sea and referenced in responses involving the NATO alliance. Beyond the territorial sea, the United States maintains a contiguous zone extending 24 nautical miles from baselines, where it may enforce laws concerning customs, fiscal matters, immigration, and sanitation—matters reflected in enforcement actions by the United States Customs and Border Protection and precedents involving the Fifth Circuit Court of Appeals.

Exclusive Economic Zone and Continental Shelf

The U.S. EEZ extends 200 nautical miles from baselines where applicable, establishing sovereign rights for exploration and exploitation of natural resources, including fisheries, hydrocarbons, and seabed minerals. The EEZ regime is operationalized under statutes such as the Outer Continental Shelf Lands Act and regulatory frameworks from the Bureau of Ocean Energy Management. Continental shelf claims beyond 200 nautical miles rely on scientific submissions to the Commission on the Limits of the Continental Shelf and have prompted domestic coordination among agencies like the National Aeronautics and Space Administration for mapping and the United States Geological Survey for geologic assessment. Energy development controversies in areas offshore of Alaska, Gulf of Mexico, and Atlantic Coast states have invoked litigation involving the Supreme Court of the United States and policy debates in the United States Congress.

State vs Federal Jurisdiction

Coastal states such as California, Texas, Louisiana, and Florida exercise jurisdiction in coastal waters seaward of their baselines typically to 3 nautical miles (extended to 9 nautical miles for Texas and Florida Gulf coast islands), with rights over fishing and environmental regulation under state constitutions and statutes. Federal jurisdiction generally applies beyond state waters and in matters implicating national security, international obligations, and interstate commerce, involving agencies like the Department of Defense and the Federal Energy Regulatory Commission. Disputes over submerged lands and resource allocation have been litigated in cases before the United States Supreme Court, invoking precedents such as older territorial waters rulings and state compacts like the Maryland–Virginia compact.

Law Enforcement and Resource Management

Enforcement of law in U.S. maritime zones involves multi-agency coordination among the United States Coast Guard, National Marine Fisheries Service, Bureau of Safety and Environmental Enforcement, and state marine patrols, using authorities from statutes like the Lacey Act and the Magnuson–Stevens Act. Fisheries management plans developed by regional Fishery Management Councils—including the New England Fishery Management Council and the Pacific Fishery Management Council—regulate catch limits, gear, and seasonality within EEZ waters. Environmental protection and spill response rely on frameworks such as the Oil Pollution Act of 1990 and cooperative arrangements with neighboring states and entities like the International Maritime Organization in cases of pollution incidents.

International Law and Treaties

Although the United States has not ratified the UNCLOS treaty, U.S. practice accepts many UNCLOS norms as customary international law, a stance reflected in submissions to maritime boundary commissions and in diplomatic engagements with Canada, Mexico, Russia, and regional partners. Bilateral treaties—such as maritime delimitation agreements with Canada (1977) and later understandings in the Beaufort Sea area—along with arbitration precedents like those from the International Tribunal for the Law of the Sea influence U.S. strategy. Congressional actions, presidential proclamations, and participation in international organizations, including the International Maritime Organization, continue to shape the legal landscape of U.S. maritime zones.

Category:Maritime law of the United States