Geography of world trade

The first principle

About four fifths of world trade by volume moves by sea, because ships carry heavy goods over long distances at the lowest cost per tonne. Ships must follow the shape of the land, so wherever continents come close, through a narrow strait or a canal cut across a narrow isthmus, routes converge and a few kilometres of water carry a large share of the world's goods. Where the world's factories and buyers are located decides which of these routes are busiest, and that location has been shifting from the Atlantic to the Indo Pacific. India sits in the middle of the Indian Ocean routes, a position that begins with its own geography as a subcontinent.

The core

Why India is called a subcontinent

A subcontinent is a large, distinct part of a continent with its own physical identity. The Indian subcontinent, comprising India, Pakistan, Nepal, Bhutan, Bangladesh and Sri Lanka, qualifies for several reasons.

• A distinct physical unit. The Himalaya with the Karakoram and Hindu Kush in the north, the Sulaiman and Kirthar ranges in the west and the Purvanchal and Arakan hills in the east form a continuous mountain wall, while the Arabian Sea, the Bay of Bengal and the Indian Ocean bound the other three sides. This wall has separated the region from the rest of Asia in climate, flora and culture.
• Its own plate and geological history. The Indian Plate broke away from Gondwana, drifted north and collided with the Eurasian Plate about 50 million years ago, raising the Himalaya, so the region is geologically distinct from the rest of Asia (the details are in the note on plate tectonics).
• Size. India alone covers about 3.29 million square kilometres, the seventh largest country in the world, and stretches about 3,200 km from north to south and about 2,900 km from east to west.
• Every major landform. Young fold mountains, the Indus Ganga Brahmaputra plain, the ancient peninsular plateau, the Thar desert, long coasts and island groups all occur within it.
• Its own climate system. The monsoon, reversed each season by the heating of the land and the barrier of the Himalaya, gives the whole region a common rhythm of seasons.
• Diversity of peoples. Several language families, all major religions and many ethnic groups live here, linked by long shared history.

Straits and isthmuses

A strait is a narrow sea passage joining two larger water bodies, such as the Strait of Malacca between the Indian Ocean and the South China Sea. An isthmus is a narrow strip of land joining two larger land masses, such as the Isthmus of Suez between Africa and Asia or the Isthmus of Panama between North and South America. Straits are natural shortcuts for ships, while isthmuses block them until a canal is cut across, as at Suez (1869) and Panama (1914). Both create chokepoints, where a single accident, war or drought can stop a large part of world trade.

Dimensions

• Economic. Chokepoints save thousands of kilometres; the route from Asia to Europe through Suez is about 6,000 to 7,000 km shorter than going round the Cape of Good Hope, saving one to two weeks.
• Energy security. Much of India's crude and liquefied natural gas (LNG) comes through Hormuz, and East Asia's energy imports pass through Malacca.
• Strategic. Navies guard chokepoints because closing one is a powerful weapon, which is why the Indian Navy patrols the Gulf of Aden and the Andaman and Nicobar Islands overlook the western end of Malacca.
• Environmental. Crowded straits raise collision and spill risk, and canal operations depend on water, as Panama's drought showed.

In practice

The significance of key chokepoints

• Strait of Hormuz joins the Persian Gulf to the Arabian Sea and carries about a fifth of the world's oil, according to the US Energy Information Administration (EIA), so tension between Iran and its rivals moves oil prices at once.
• Strait of Malacca between the Malay Peninsula and Sumatra is the busiest strait for East Asia's oil and goods; China's fear of a blockade here, its "Malacca dilemma", drives its search for pipelines and ports in Myanmar and Pakistan.
• Bab el Mandeb joins the Red Sea to the Gulf of Aden. Attacks on shipping by Yemen's Houthi forces from November 2023 forced most container lines to sail round Africa, and Suez Canal traffic fell by more than half in 2024.
• Suez Canal across the Isthmus of Suez joins the Mediterranean and the Red Sea. When the container ship Ever Given ran aground in March 2021, the canal was blocked for six days and hundreds of ships queued.
• Panama Canal across the Isthmus of Panama lifts ships with locks fed by the rain fed Gatun Lake. A drought linked to El Niño in 2023 cut the lake's level, so daily transits were reduced for months.
• Bosphorus and Dardanelles link the Black Sea to the Mediterranean and carry grain and oil from Russia, Ukraine and Kazakhstan; the Black Sea Grain Initiative (July 2022 to July 2023) kept Ukrainian grain moving through them.
• Gibraltar and Dover are Europe's busiest approaches; the Dover Strait is among the busiest shipping lanes in the world.

Is the centre of global trade shifting to the Indo Pacific?

The Indo Pacific is the joined space of the Indian and Pacific Oceans, from the east coast of Africa to the west coast of the Americas. The evidence of a shift is strong.

• Manufacturing has moved east. China, Japan, South Korea, the Association of Southeast Asian Nations (ASEAN) and now India make most of the world's manufactured goods, and global supply chains for electronics, vehicles and clothing run through East and South East Asia.
• Ports. All of the world's ten busiest container ports are in Asia, led by Shanghai, Singapore and Ningbo Zhoushan, while Rotterdam, Europe's largest, lies outside the top ten.
• Output. The Indo Pacific produces over 60 per cent of world output, and Asia has given the largest share of global growth for two decades, according to International Monetary Fund (IMF) estimates.
• Trade agreements and corridors. The Regional Comprehensive Economic Partnership (RCEP, in force since January 2022), the largest free trade bloc, and new links such as the India Middle East Europe Economic Corridor (IMEC, announced at the G20 summit in New Delhi in September 2023) and the Chennai Vladivostok maritime corridor tie the region closer.

The counter view also has weight. The United States and the European Union remain the largest single markets, and Asian exporters depend on their demand. Finance, insurance, shipping law and the dollar are still centred on the Atlantic, as are many technology and services firms. The Indo Pacific also carries more risk, with disputes in the South China Sea and crowded chokepoints. A balanced conclusion is that the centre of goods trade has already moved to the Indo Pacific, while control of money, rules and technology is moving more slowly.

For India the shift is an opportunity, as it sits astride the sea lanes between the Gulf, Africa and East Asia. Sagarmala (Ministry of Ports, Shipping and Waterways, 2015) is building port capacity, the Vizhinjam deep water transhipment port in Kerala opened in 2025, and Great Nicobar is planned to sit beside the Malacca route.

Issues and way forward

• Chokepoint vulnerability. Disruptions at Bab el Mandeb or Hormuz raise India's freight and fuel costs; diverse crude sources, strategic reserves and naval presence reduce the risk.
• Transhipment dependence. A large share of India's containers has been transhipped through Colombo, Singapore and other foreign hubs, because Indian ports lacked depth; the Maritime India Vision 2030 (2021) calls for deep water hubs to end this.
• Climate risk to canals. Droughts at Panama and storms in the Red Sea show that canals depend on climate; new water reservoirs and alternative routes, such as Arctic shipping, are being studied.
• Contested waters. Freedom of navigation under the United Nations Convention on the Law of the Sea (UNCLOS), 1982 is the legal basis for keeping straits open, and India supports it in forums such as the Quad.

Common confusions

• Strait and isthmus. A strait is narrow water between two land masses; an isthmus is narrow land between two water bodies.
• Subcontinent and continent. A subcontinent is part of a continent with its own identity, not a separate continent; the Indian subcontinent is part of Asia.
• Indo Pacific and Asia Pacific. Asia Pacific left out the Indian Ocean; Indo Pacific includes it and so places India at the centre.

For the exam

• Keyword bank: subcontinent, Indian Plate, mountain wall, strait, isthmus, chokepoint, Hormuz, Malacca dilemma, Bab el Mandeb, Suez, Panama, transhipment, Indo Pacific, RCEP, IMEC, sea lanes of communication.
• Previous year questions: Practise the previous year questions on this topic →
• Use in an answer:
  • Introduction (event): When the Ever Given blocked the Suez Canal for six days in March 2021, hundreds of ships queued, showing how a few hundred metres of water can hold up world trade.
  • Introduction (data): All ten of the world's busiest container ports are now in Asia, a clear sign that the centre of goods trade has moved to the Indo Pacific.
  • Conclusion: Geography has made India both a subcontinent apart and a crossroads of the Indian Ocean, and its prosperity depends on turning that position into ports, ships and secure sea lanes.
  • Conclusion: The world's goods now move mainly through the Indo Pacific, but its money and rules still flow through the Atlantic, so the shift is real but incomplete.