Chokepoints: the eight straits and canals that govern global trade

What it is

Roughly 90% of global merchandise trade moves by sea, and a handful of narrow passages handle a disproportionate share. A chokepoint is a strait or canal so geographically constricted, or so well positioned between major ocean basins, that cargo has no practical alternative without adding days of sailing time and millions of dollars in fuel costs. The U.S. Energy Information Administration identifies eight: the Strait of Hormuz, Strait of Malacca, Suez Canal, Bab-el-Mandeb, Panama Canal, Turkish Straits, Kerch Strait, and the Cape of Good Hope passage. Together they carry more than 60% of global seaborne energy. Closure of any one shifts freight rates, insurance premiums, and commodity prices within days.

History

These passages mattered before oil. The Ottoman Empire controlled the Turkish Straits from 1453; Bosphorus access was a casus belli through the Crimean War (1853-1856) and both World Wars, eventually codified by the 1936 Montreux Convention. The Suez Canal, opened in 1869, halved the Europe-to-Asia sailing distance; Egypt's 1956 nationalization triggered a British-French-Israeli invasion. The Strait of Hormuz became a defining energy-security chokepoint after the 1973 Arab oil embargo, and the Iran-Iraq Tanker War (1980-1988) proved that intermittent attacks on tankers could spike global insurance premiums and reshape OPEC production strategy. The Panama Canal, opened in 1914 and expanded in 2016, grew to accommodate liquefied natural gas carriers and neo-Panamax containerships. Houthi attacks beginning November 2023 produced the Bab-el-Mandeb's first sustained commercial closure.

Current state

As of early July 2026, three of the eight chokepoints face active disruptions. Iran's June 2026 conflict with Israel reduced Hormuz traffic to roughly one-third of pre-war normal; Iranian mines and IRGC attacks on commercial vessels prompted the IMO to launch an emergency evacuation plan on June 23. The clearance of the tanker backlog is producing a supply overhang that holds Brent near US$67-68 per barrel and extends the Q2 2026 oil price collapse. The Bab-el-Mandeb remains effectively closed to most commercial shipping; Gulf of Aden tonnage fell 76% by mid-2024 from its 2023 peak and has not recovered. Turkey proposed a formal Bosphorus transit-fee system in July 2026, the first governance challenge to the Montreux Convention regime in decades. The Cape of Good Hope has absorbed diverted traffic from both the Red Sea and Hormuz corridors, adding 10-14 days to Europe-Asia voyages and lifting container spot rates 29-129% on key lanes.

Relationships

The eight subjects interact directly. Hormuz and Malacca are in series for most Middle East-to-Asia oil routes: tankers loading at Saudi Arabia's Ras Tanura terminal pass through Hormuz, cross the Indian Ocean, and enter the South China Sea via Malacca. China, India, Japan, and South Korea collectively received 69% of Hormuz crude in 2024 and depend on Malacca for onward delivery. Suez and Bab-el-Mandeb are also in series, forming the Red Sea corridor; disruption at one effectively closes the other commercially and activates the Cape route. The Turkish Straits and Kerch Strait are in series for Black Sea exports; Russia's 2022 invasion of Ukraine suspended Ukrainian use of the Kerch Strait, leaving the Bosphorus as the only Black Sea exit and granting Ankara new strategic leverage. The Panama Canal links the Pacific and Atlantic; the 2024 drought cut deep-draft transits 36% from peak. The OPEC+ output strategy is calibrated partly against Hormuz-risk premiums, as a credible closure threat can support oil prices even during a glut.

What to watch

Iran's 60-day ceasefire MoU expires near August 16, 2026, compressing the nuclear and strait-sovereignty negotiation into six weeks. The IRGC publicly rejected the US military hotline after the Doha talks concluded July 2, and Iran's core demand for passage fees and joint coastal-state control over Hormuz is unresolved. The Houthi posture in Yemen determines whether Bab-el-Mandeb rerouting persists through late 2026. Turkey's Bosphorus fee proposal will face Montreux Convention challenges if Ankara presses it. The Kerch Strait's status is tied directly to any Ukrainian-Russian ceasefire. Panama Canal throughput is subject to La Niña precipitation forecasts for late 2026. Across all eight passages, the structural risk is simultaneity: the 2025 Nature Communications study found that multi-chokepoint disruptions produce systemic network effects far larger than single-closure scenarios modeled in isolation.