Strait of Malacca

The Strait of Malacca is a slim waterway, roughly 900 kilometers long and varying in width from 65 to 250 kilometers. It sits between the Malay Peninsula to the northeast and the Indonesian island of Sumatra to the southwest, linking the Andaman Sea—part of the Indian Ocean—with the South China Sea, which belongs to the Pacific. Because it serves as the primary maritime route between these two oceans, it ranks among the world’s most vital shipping channels.

Each year, more than 94,000 vessels traverse the strait (as of 2008), making it the busiest strait globally. It carries about a quarter of all goods traded worldwide, including oil, Chinese manufactured products, coal, palm oil, and Indonesian coffee. By 2024, over 35% of seaborne oil and 20% of gas passed through these waters. The heavy traffic has made modern piracy and smuggling ongoing concerns.

Historically, the strait has been a contested zone. In the 7th century, the Srivijaya empire seized control of the region to dominate the spice trade. Later, prosperous states like the Malacca Sultanate, the Johor Sultanate, the British Straits Settlements, and the city-state of Singapore held sway over it.

The name "Malacca" is traditionally linked to the Malacca tree, also known as the Indian gooseberry tree, and is thought to come from the Malay word "Melaka." Legend says that Parameswara, a Sumatran prince who founded the Malacca Sultanate, chose the site for his new kingdom where the city of Malacca now stands. He supposedly named it "Melaka" after the tree under which he had rested. Over time, the name came to apply to the strategically important waterway itself.

The International Hydrographic Organization has set specific limits for the strait. Early traders from Arabia, Africa, India, and Persia reached Kedah before sailing on to Guangzhou. Kedah served as a western port on the Malay Peninsula, trading goods like glassware, camphor, cotton, brocades, ivory, sandalwood, perfume, and precious stones. They arrived with the monsoon winds between June and November and departed from December to May. Kedah offered accommodations, porters, small vessels, bamboo rafts, elephants, and tax collection for overland transport to eastern ports such as Langkasuka and Kelantan. After the 10th century, Chinese ships began trading at these eastern posts. Kedah and Funan were prominent ports through the 6th century, before shipping started using the Strait of Malacca itself as a trade route.

In the 7th century, the Srivijaya maritime empire, based in Palembang, Sumatra, rose to power and extended its influence to the Malay Peninsula and Java. It controlled two key maritime choke points: the Strait of Malacca and the Sunda Strait. Through conquests and raids on rival ports, Srivijaya maintained economic and military dominance for about 700 years, benefiting greatly from the spice trade, including tributary trade with China and commerce with Indian and Arab merchants. The strait became a vital route between India and China. Its importance persisted through later centuries with the Malacca Sultanate in the 15th century, the Johor Sultanate, the Straits Settlements, and modern Singapore. Since the 17th century, it has been the main shipping channel between the Indian and Pacific Oceans, managed by various regional powers over time.

Economically and strategically, the strait is crucial. It links major Asian economies like India, Thailand, Indonesia, Malaysia, the Philippines, Singapore, Vietnam, China, Japan, Taiwan, and South Korea. It also forms part of the Maritime Silk Road, running from China’s coast to southern India, then through the Red Sea and Suez Canal to the Mediterranean, and onward to Trieste in Italy, with rail connections to Central Europe and the North Sea. In 2007, about 13.7 million barrels of oil per day moved through the strait, rising to 15.2 million barrels per day by 2011. It is also one of the world’s most congested shipping choke points, narrowing to just 2.8 kilometers wide at the Phillip Channel near southern Singapore. Some of the largest ships—mostly oil tankers—have drafts exceeding the strait’s minimum depth of 25 meters, which occurs in the Singapore Strait. The maximum vessel size that can pass is called Malaccamax. The alternative Sunda Strait, between Sumatra and Java, is even shallower and narrower, forcing ships too large for the Malaccamax to detour thousands of nautical miles through the Lombok Strait, Makassar Strait, or Sibutu Passage.