The Strait of Malacca runs between the Malay Peninsula (Malaysia, Singapore, southern Thailand) to the northeast and the Indonesian island of Sumatra to the southwest. See the interactive map above for its precise location.

In coordinate terms, the strait runs from approximately 6°N, 99°E in the north (near the Isthmus of Kra, Thailand) to 1°N, 104°E in the south (Philip Channel, Singapore). It connects the Andaman Sea to the South China Sea — and through them, the Indian Ocean to the Pacific Ocean.

At Philip Channel, near Singapore, the Strait of Malacca narrows to just 2.7–2.8 kilometres — roughly 1.7 miles. This is barely wider than the turning radius of a modern ultra-large container ship. All traffic — regardless of vessel type or size — must converge through this extraordinarily narrow passage.

By contrast, the strait’s widest point near Thailand measures approximately 250 kilometres. The dramatic narrowing from 250 km to 2.7 km over 900 km is what creates the “funnel” that gives the strait its bottleneck power.

Yes — by vessel count, the Strait of Malacca (together with the adjacent Singapore Strait) is the world’s busiest shipping strait. In 2025, it recorded its highest-ever transit numbers: over 100,000 vessels — up 8.72% from 94,301 in 2024, equating to approximately 281 ship reports per day to Malaysia’s Klang VTS (Vessel Traffic Service).

The four largest categories by daily average in 2025 were: container ships (74/day), tankers (60/day, excluding laden VLCCs), dry bulk carriers (57/day), and deep-draught vessels including VLCCs (28/day — nearly doubled in a decade).

The “Malacca Dilemma” was a term coined by Chinese President Hu Jintao in 2003 to describe China’s acute strategic vulnerability: with roughly 80% of China’s imported crude oil transiting this single narrow passage, any naval adversary capable of blockading Philip Channel — most plausibly the United States or India — could bring China’s economy to its knees without firing a shot on Chinese soil.

China has invested heavily in alternatives — overland pipelines through Myanmar and Central Asia, Gwadar Port in Pakistan, and naval bases across the Indian Ocean (the “String of Pearls”). None has come close to solving the dilemma. The Myanmar pipeline handles ~440,000 barrels per day; China’s daily oil import need is roughly 11 million barrels. The dilemma remains structurally unresolved.

No single nation owns or controls the Strait of Malacca. Under the United Nations Convention on the Law of the Sea (UNCLOS), the strait is classified as an international navigation corridor. All vessels — regardless of flag — have an unimpeded right of “transit passage.”

The three littoral states — Malaysia, Indonesia, and Singapore — each exercise sovereignty over their respective 12-nautical-mile territorial waters within the strait. However, that sovereignty does not permit them to close the strait or charge transit fees. UNCLOS Articles 37–44 explicitly prohibit this. Their role is that of joint stewards, not gatekeepers: managing traffic safety, combating piracy, and protecting the marine environment.

Strategically, the US Navy maintains dominant regional presence; India monitors from the Andaman and Nicobar Islands; and China has been expanding its blue-water naval capability partly to contest potential adversary control.

Both are critical global chokepoints, but they differ in important ways. By oil volume alone, Hormuz edges it slightly (17M vs 16M barrels per day). But by total trade value and breadth, Malacca is the more consequential chokepoint — it carries containers, bulk goods, vehicles, food, and critical minerals in addition to energy, serving 12+ major economies simultaneously.

Crucially, Malacca is far harder to replace. Hormuz has theoretical overland pipeline alternatives (though limited capacity). Malacca’s alternatives — Lombok and Sunda Straits — add 1,000–1,500 nautical miles. In 2026, with Hormuz effectively closed by Iran’s military action, attention has shifted sharply to Malacca as the next critical vulnerability in global supply chains.

The strait takes its name from the historic port city of Melaka (Malacca), which controlled trade through these waters during the height of the Malacca Sultanate in the 15th century.

According to the Sejarah Melayu (Malay Annals), the city was founded by the Srivijayan prince Parameswara around 1400 CE. Resting under a pokok melaka (Indian gooseberry tree, Phyllanthus emblica), he watched a tiny mouse deer kick one of his hunting dogs into the river — taking this as an auspicious omen, he named his new kingdom after the tree.

Alternative etymologies include: Arabic Malakat (“congregation of merchants”); Arabic Malqa (“meeting place”); or Javanese mlayu (“to run”). Under Portuguese, Dutch, and British colonial rule, the spelling varied — today Malaysia officially uses the Malay spelling Melaka.

A closure of the Strait of Malacca would be a global economic catastrophe. The immediate effects would include: a sharp spike in global oil prices, as 16 million barrels per day of oil flow would need to be rerouted; severe shortages of semiconductors, electronics, and manufactured goods from East Asian suppliers; disruption of automotive supply chains (particularly electric vehicles); and food price shocks as grain and agricultural commodity flows were interrupted.

The knock-on effects would cascade across every continent. Alternative routes via Lombok and Sunda Straits add 3–5 days and significant cost — and lack Singapore’s world-class refuelling and transshipment infrastructure. A sustained closure would likely trigger recession in Japan, South Korea, and Taiwan within weeks, and severely stress China’s economy within months.