# Travel >> Transportation >> Boats

What Is an International Waterway?

An international waterway is a navigable body of water (river, lake, canal, strait, or sea) that connects two or more countries and is open to vessels of all nations under international law or treaty.

Key Characteristics

Transboundary: Flows through or borders multiple states.
Navigable: Supports commercial or civilian vessel traffic.
Governed by treaties: Freedom of navigation, non-discriminatory tolls, environmental protection, dispute resolution.

Major Examples

Waterway	Connects	Key Treaty/Regime
Suez Canal	Mediterranean ↔ Red Sea	Convention of Constantinople (1888)
Panama Canal	Atlantic ↔ Pacific	Torrijos–Carter Treaties (1977), ACP neutrality
Strait of Gibraltar	Mediterranean ↔ Atlantic	UNCLOS (transit passage)
Bosporus & Dardanelles	Black Sea ↔ Mediterranean	Montreux Convention (1936)
Danube River	Germany → Black Sea (10 countries)	Belgrade Convention (1948), EU Danube Strategy
Rhine River	Switzerland → Netherlands (6 countries)	Central Commission for Navigation on the Rhine (1815/1963)
St. Lawrence Seaway	Great Lakes ↔ Atlantic (US/Canada)	1954 Agreement, joint management

Why They Matter

Global trade arteries (90% of goods by volume move by sea).
Energy security (oil, LNG transit).
Geopolitical flashpoints (chokepoints).
Environmental corridors (migratory species, pollution transport).

UNCLOS (1982) provides the overarching legal framework: transit passage through straits, innocent passage in territorial seas, freedom of navigation on high seas.

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Boats