Maritime chokepoints

Contents

Maritime chokepoints are narrow sea passages, straits, canals, and passages where maritime traffic concentrates and may be constrained by geography, infrastructure, or political control. These locations include transits such as the Strait of Hormuz, Suez Canal, Panama Canal, and Strait of Malacca, and they intersect with major shipping routes used by vessels bound for Shanghai, Rotterdam, Hamburg, Long Beach and Antwerp. Chokepoints affect trade between trading hubs like New York City, Singapore, Hong Kong, Dubai, and Mumbai and influence policies of states including United States, China, Russia, Saudi Arabia, and United Kingdom.

Overview

Maritime chokepoints comprise geographic features such as the Bab-el-Mandeb, Bosporus, Dardanelles, Strait of Gibraltar, and Lombok Strait that constrain passage between seas and oceans and link ports such as Alexandria, Istanbul, Valletta, Colombo, and Jakarta. Their functions intersect with infrastructure like the Suez Canal Company, the Panama Canal Authority, and ports administered by entities such as the Port of Singapore Authority, Port of Rotterdam Authority, and DP World. Chokepoints are influenced by international agreements such as the United Nations Convention on the Law of the Sea, regional arrangements like the Treaty of Lausanne, and historical compacts including the Congress of Vienna.

Well-known chokepoints include the Strait of Hormuz near Muscat and Abu Dhabi, the Suez Canal adjacent to Cairo and Ismailia, the Panama Canal connecting Balboa and Colón, and the Strait of Malacca flanked by Singapore and Penang. Other critical passages are the Gibraltar Strait by Gibraltar and Algeciras, the Bosporus by Istanbul and Varna, the Bering Strait near Nome and Dixon Entrance, the Dover Strait between Dover and Calais, and the Bab-el-Mandeb by Djibouti and Aden. Less prominent but strategically relevant locations include the Lombok Strait, Sunda Strait, Makassar Strait, Mozambique Channel, Straights of Juan de Fuca, Sverdrup Channel, Tiran Strait, and Koror-Babeldaob Passage.

Chokepoints determine energy flows through routes that serve OPEC producers such as Saudi Aramco, National Iranian Oil Company, and Kuwait Petroleum Corporation and affect pipelines, tankers, and LNG shipments bound for markets in Tokyo, Seoul, Shanghai, Rotterdam, and Los Angeles. Control or disruption at chokepoints impacts shipping firms like Maersk, MSC, CMA CGM, and Evergreen Marine and insurers such as Lloyd's of London and P&I Clubs. Nations including Japan, South Korea, India, China, and United States calculate strategic dependencies using data from agencies such as the International Maritime Organization, International Energy Agency, and World Trade Organization. Financial markets in London, New York Stock Exchange, Tokyo Stock Exchange, and Hong Kong Stock Exchange respond to chokepoint disruptions via commodity prices tracked by entities like Bloomberg, Reuters, and International Monetary Fund.

Naval deployments by forces such as the United States Navy, People's Liberation Army Navy, Royal Navy, Russian Navy, and Indian Navy concentrate around chokepoints like the Gulf of Aden, Strait of Hormuz, and Suez Canal Zone. Coalition operations including Operation Atalanta, Combined Task Force 151, and exercises like RIMPAC and Malabar address piracy, interdiction, and freedom of navigation alongside legal authorities such as the United Nations Security Council resolutions. Strategic basing by states at locations like Diego Garcia, Djibouti, Aden, Akkuyu, and Souda Bay supports power projection and logistics for carrier strike groups, amphibious ready groups, and submarine patrols. Intelligence organizations including NSA, GCHQ, DGSE, MSS, and RAW monitor shipping patterns and maritime domain awareness networks coordinated with agencies such as NATO and ASEAN Regional Forum.

Narrow passages like the Strait of Malacca and Suez Canal concentrate risks from collisions, groundings, and oil spills affecting ecosystems such as the Red Sea, Persian Gulf, South China Sea, and Caribbean Sea. Incidents involving tankers operated by companies like BP, Shell, TotalEnergies, and ExxonMobil have triggered responses from organizations including the International Maritime Organization, Greenpeace, World Wildlife Fund, and national agencies like the Environmental Protection Agency and Marine Scotland. Navigational hazards include shallow channels, limited underkeel clearance, and narrow traffic separation schemes near ports such as Venice, Chittagong, Port of Santos, and Valparaíso managed via pilotage services, vessel traffic services, and aids to navigation from authorities like US Coast Guard and Maritime and Coastguard Agency.

Historic events tied to chokepoints include the Suez Crisis involving Gamal Abdel Nasser and Anthony Eden, the Six-Day War impact on the Suez Canal involving Israel, the Iran–Iraq War tanker war in the Persian Gulf affecting Basra and Kharg Island, the Yom Kippur War disruptions to oil routes, and the Fall of Saigon effects on regional shipping. Notable ship losses and crises include the Exxon Valdez grounding, the Ever Given grounding in the Suez Canal that affected companies such as Evergreen Marine and markets tracked by S&P Global, the USS Cole bombing off Aden, and pirate attacks addressed in Operation Atalanta and NATO convoys. Diplomatic episodes like the Treaty of Tordesillas, Treaty of Versailles, and Treaty of San Stefano historically shifted control of maritime access and influenced colonial ports such as Alexandria, Aden, Colombo, and Batavia.

Regulation of chokepoints operates through instruments like the United Nations Convention on the Law of the Sea, bilateral treaties exemplified by the Hay–Bunau-Varilla Treaty and Montreux Convention Regarding the Regime of the Straits, and institutions such as the Suez Canal Authority, Panama Canal Authority, International Maritime Organization, World Trade Organization, and regional bodies including Arab League and ASEAN. Private firms such as A.P. Moller–Maersk Group, COSCO, Hapag-Lloyd, and NYK Line coordinate with port authorities like Port Authority of New York and New Jersey and Shanghai International Port Group under customs regimes administered by agencies such as Customs and Border Protection and HM Revenue and Customs. Dispute mechanisms include arbitration under the International Tribunal for the Law of the Sea, adjudication in the International Court of Justice, and maritime security cooperation through frameworks like Proliferation Security Initiative and Contact Group on Piracy off the Coast of Somalia.