Freedom of the Seas: Principle and Practice

Freedom of the seas (freedom of navigation) is a cornerstone of international maritime law: ships of all states may sail the high seas without interference.

Historical Development

• 1609: Hugo Grotius, Mare Liberum – argued oceans cannot be owned; open to all.
• 17th–18th c.: Contested by Mare Clausum (Selden) – states can claim sovereignty.
• 19th c.: Customary law solidified freedoms: navigation, overflight, fishing, scientific research, cable/pipeline laying.
• 1982 UNCLOS (Law of the Sea Convention): Codified freedoms in Articles 87, 90; entered force 1994; 168 parties.

Scope & Limits

• High seas (beyond EEZ): Full freedoms for all states.
• EEZ (200 nm): Coastal state has resource rights; others retain navigation, overflight, laying cables.
• Territorial sea (12 nm): Innocent passage only; coastal state sovereignty.
• Archipelagic waters: Archipelagic sea lanes passage.

Duties & Exceptions

• Flag state jurisdiction; duty to suppress piracy, slave trade, unauthorized broadcasting.
• Environmental protection (MARPOL, ballast water).
• Security: UNSC resolutions (e.g., WMD proliferation, Somalia piracy).
• Marine scientific research requires coastal state consent in EEZ/continental shelf.

Contemporary Challenges

Excessive maritime claims (China's nine-dash line), militarization, illegal fishing, deep-seabed mining regulation, Arctic access, autonomous vessels. Freedom of navigation operations (FONOPs) by US and allies contest excessive claims. The principle remains vital for global trade (90% by sea), communication, and peace—but requires constant diplomatic and legal defense.