The world has gates

Most of what you own crossed an ocean to reach you, because sea transport is cheap and everything else is not. But a glance at the map shows the oceans are not open plains — they are corridors, and the corridors pinch shut at a few narrow straits and canals. These **chokepoints** are where geography quietly hands out power: hold one, and you can tax, watch, or throttle a large share of world trade.

Hormuz — the oil valve

The single most important gate opens onto the **Persian Gulf**. Roughly a fifth of all oil consumed on Earth leaves through the **Strait of Hormuz**, about 39 km wide, with Iran along its northern shore. There is no real bypass for most of it. Every US carrier deployment to the Gulf, every Iranian threat to "close the strait," and much of the region's arms spending is priced off this one channel.

Claim (consensus): Around a fifth of global petroleum liquids consumption passes through the Strait of Hormuz, with no pipeline capacity able to bypass most of it — making it the world's most critical oil chokepoint.

Malacca — the Asia funnel

East of the Indian Ocean, the sea lane to China, Japan and Korea squeezes through the **Strait of Malacca**, 2.8 km at its narrowest. About a quarter of the world's traded goods and most of East Asia's energy pass here. It is the reason Singapore is rich, and the reason China spends fortunes on overland routes to avoid depending on it.

Claim (consensus): Roughly a quarter of world trade and most of East Asia's oil imports transit the Strait of Malacca, making it the busiest strategic chokepoint in Asia.

Bab-el-Mandeb and Suez — the shortcut

The short way from Asia to Europe threads the **Red Sea**: in at the **Bab-el-Mandeb** ("Gate of Grief") by Yemen, out through the **Suez Canal** at Egypt. About 12% of world trade uses it — and in 2024 Houthi missiles showed how cheaply the trench can be closed. Ships rerouting around the whole of Africa add roughly ten days and a fortune per voyage, a live demonstration of what a chokepoint is worth.

Claim (consensus): The Red Sea / Suez corridor normally carries about 12% of world trade; 2024 attacks at Bab-el-Mandeb forced mass reroutes around Africa, adding ~10 days per Asia–Europe voyage.

The Turkish Straits — the Black Sea's only door

The **Black Sea** has exactly one way out: the **Bosporus** and Dardanelles, through the heart of Istanbul, a channel 700 m wide at its narrowest. Turkey governs passage under the 1936 Montreux Convention. Russian warships, Ukrainian grain, and every Black Sea trade all pass Turkish shores — which is why Turkey is courted by every side of every Black Sea crisis.

Claim (consensus): All maritime traffic in and out of the Black Sea must pass the Turkish Straits, whose transit Turkey regulates under the Montreux Convention — a permanent source of leverage.

Panama — the two-ocean shortcut

In the Americas, a 50-mile cut through the isthmus of **Panama** saves ships the entire voyage around South America. But the canal lifts vessels over a mountain using fresh water from a rain-fed lake — so in the 2023–24 drought, Panama had to cut crossings, and global shipping felt it. A reminder that even engineered chokepoints still obey their watersheds.

Claim (consensus): The Panama Canal depends on freshwater from Gatún Lake; the 2023–24 drought forced draft-and-transit restrictions that disrupted global shipping, showing engineered chokepoints remain climate-dependent.

Europe's ocean doors

Europe has its own gates. The **Strait of Gibraltar**, 13 km wide, corks the Mediterranean's Atlantic end — held by Britain since 1704 precisely because whoever holds it can close a sea. To the north, the **English Channel** and the Danish straits control the approaches to the North Sea and Baltic. Control of narrow water has shaped European power for five centuries.

Claim (consensus): Gibraltar, the English Channel and the Danish straits are the maritime gates of Western and Northern Europe, and control of them has been a persistent object of European strategy.

The map of leverage

Put the gates together and you have a map of where power concentrates. Chokepoints are why small states astride them (Singapore, Panama, Egypt, Turkey) punch far above their weight; why great powers keep navies; and why a single drought, blockade or drone can ripple through the whole world economy. Trade looks borderless until you notice it all has to pass through the same few doors.