Maritime Chokepoints — The Narrow Gates World Trade Depends On

A maritime chokepoint is a narrow stretch of water that a huge share of world shipping has to pass through because there is no practical way around it. Some are natural straits, like Hormuz or Malacca, where two landmasses pinch the sea into a few miles of navigable water; others are dug canals, like Suez and Panama, that cut a shortcut through land. What they share is leverage: because so much traffic concentrates into so little space, a blockage, accident or conflict at a single chokepoint can disrupt trade across the whole planet (US EIA, World Oil Transit Chokepoints, 2026; UNCTAD).

In the first half of 2025, about 20.9 million barrels a day of oil and petroleum liquids flowed through the Strait of Hormuz — roughly a quarter of all seaborne oil trade and about a fifth of total world oil consumption, plus around a fifth of the world's LNG (US EIA, March 2026). It is the only sea route out of the Persian Gulf, just 21 miles wide at its narrowest, and there is almost no way to bypass it, which is why any threat to close it sends oil prices spiking worldwide. (During the 2026 Iran conflict, most traffic was diverted and the figures above are the normal-times structural numbers.)

The Strait of Malacca is the busiest sea-gate on Earth and the shortest route between the Indian Ocean and the Pacific. Roughly a quarter of all the world's seaborne trade — somewhere around 22–30% by various counts — threads through it, including about 80% of China's oil imports and most of the energy bound for Japan and South Korea, carried on more than 100,000 ships a year. At the Phillips Channel near Singapore it narrows to under two miles. The only alternative is a long, costly detour south of Indonesia (CSIS; Malaysia Marine Department, 2025; US EIA).

In normal times the Suez Canal carries on the order of 10–15% of world trade and about 20% of the world's container traffic, saving roughly 8–10 days over the long route around Africa (UNCTAD; IMF, 2024). When the container ship Ever Given wedged across it in March 2021, it halted an estimated $9 billion of trade a day until it was freed (BBC). Since late 2023, attacks on shipping in the Red Sea have pushed a large share of Suez traffic the long way round the Cape of Good Hope instead.

Bab-el-Mandeb — the 'Gate of Grief,' about 18 miles wide — is the strait where the Red Sea meets the Gulf of Aden. It is the southern door of the same Europe–Asia artery that the Suez Canal forms the northern end of: every ship using Suez must also pass through Bab-el-Mandeb. That makes it the more exposed half of the route. Since 2023, Houthi attacks on shipping there have driven much of the traffic away from it and around the Cape, cutting oil flows from about 9.3 million barrels a day in 2023 to roughly 4.2 million by the first half of 2025 (US EIA, March 2026).

The Panama Canal, opened in 1914, lifts ships over the isthmus of Panama using locks, cutting about 8,000 miles off the voyage between the Atlantic and the Pacific. Around 14,000 vessels and roughly 2.5–5% of world trade pass through it each year, concentrated in high-value cargo like containers, cars and grain, including a large share of US container shipments (Panama Canal Authority, 2025; Chartered Institute of Export). Because the locks are filled with fresh rainwater from nearby lakes rather than seawater, a severe drought — as in 2023–24 — forces sharp cuts to how many and how large the ships can be.

Beyond the big three, several gates control whole seas. The Bosphorus and the wider Turkish Straits are the only sea exit from the Black Sea, winding through Istanbul and carrying Russian and Caspian oil and much of the world's grain; the Bosphorus narrows to about 700 metres. The Strait of Gibraltar, under nine miles wide, is the sole gate between the Atlantic and the Mediterranean, with around 300 ships a day. The Danish Straits are the only way in and out of the Baltic and the main route for Russia's Baltic oil exports. Each is a single point of failure for the trade of an entire region (US EIA, 2026; regional port authorities, 2025).

No — and the map flags it honestly as the great detour rather than a chokepoint. The southern tip of Africa is open water, not a narrows. But it is the fallback route the whole system leans on: when Suez or Bab-el-Mandeb is blocked or unsafe, ships sail right around the Cape instead, adding roughly 3,000–5,000 nautical miles and 7–14 days to an Asia–Europe voyage. Since the 2023 Red Sea crisis, a huge share of container traffic has taken exactly this detour, which is why a problem at one gate quietly raises shipping costs everywhere (US EIA; UNCTAD, 2025).

Because the alternatives are so much longer and there is no spare capacity sitting idle. When a gate closes, the ships that would have used it have to take a far longer route — burning more fuel, taking more days, and tying up vessels and containers that are then unavailable elsewhere. That tightens shipping capacity globally, so freight rates climb on routes that never went near the closed gate at all. Add the cargo itself — a fifth of the world's oil at Hormuz, a quarter of traded goods at Malacca — and a disruption at a single pinch-point ripples into fuel prices, factory schedules and store shelves on every continent.

Yes — that is the point of pairing this layer with the Earth canvas. This overlay is the authored 'why': it marks where the gates are and explains what each one carries. Switch on Earth's Ships layer and you will see the live 'what's happening now' — real vessels bunching up as they queue for these same narrow passages. The chokepoints overlay shows the structure; the live ships show today's traffic flowing through it.