The Geography of Transport Systems
Jean-Paul Rodrigue (2017), New York: Routledge, 440 pages.
ISBN 978-1138669574
Strategic Maritime Passages
Authors: Dr. Jean-Paul Rodrigue and Dr. Theo Notteboom
1. Global Maritime Routes and Chokepoints
Maritime transportation is the dominant purveyor of international freight distribution and evolves over a global maritime space. This space has its own constrains such as the profile of continental masses and the detours and passages it creates. Maritime routes are spaces of a few kilometers wide trying to avoid the discontinuities of land transport. They are a function of obligatory points of passage, which are almost all strategic places, physical constraints such coasts, winds, marine currents, depth, reefs, or ice and political boundaries where sovereignty may impede circulation. The majority of the maritime circulation takes place along coasts and three continents have limited fluvial trade (Africa, Australia and Asia; except China).
International maritime routes are thus forced to pass through specific locations corresponding to passages, capes and straits. These routes are generally located between major markets such as Western Europe, North America and East Asia where an active system of commercial containerized trade is in place. The importance of these large markets are structuring the exchanges of semi-finished and finished goods. Also, major routes involve flows of raw materials, namely minerals, grains, food products, and most importantly petroleum. The location of strategic oil and mineral resources shapes maritime routes for bulks since they represent the most transported commodities. For instance, over 30 million barrels of oil per day are being shipped around the world.
The most important strategic maritime passages are known as chokepoints (or bottlenecks) due to:
  • Capacity constraints. Chokepoints tend to be shallow and narrow, impairing navigation and imposing capacity limits on ships. For canals such as Panama and Suez, the capacity must effectively be managed with appointment and pricing systems.
  • Potential for disruptions or closure. Disruption of trade flows through any of these export routes could have a significant impact on the world economy. Many chokepoints are next to politically unstable countries, increasing the risk of compromising their access and use, such as with piracy. Closures are a rare instance that only took place in situations of war as one proponent prevented another to access and use the chokepoint (e.g. Gibraltar and Suez during World War II). A closure of a maritime chokepoint in the current global economy, even if temporary, would have important economic consequences with the disruption of trade flows and even the interruption of some supply chains (e.g. oil). These potential risks and impacts are commonly used to justify military naval assets to protect sea lanes even if such benefits are difficult to demonstrate.
Changes in the technical and operational characteristics of transoceanic canals and passages can have substantial impacts on global trade patterns. The Panama Canal, the Suez Canal, the Strait of Malacca and the Strait of Hormuz account for the world's four most important strategic maritime passages in part because of the chokepoints they impose on global freight circulation and in part because of the economic activities and resources they grant more efficient access to. Their continuous availability for global maritime circulation is challenging dominantly because the global trade system is highly reliant on their use. Yet, they have shaped global trade with the ongoing setting of rings of circulation, notably in the northern hemisphere.
In addition to the transoceanic canals, "dry canals" have also been constructed or under consideration. They are called dry canals because they replicate the role of regular canals, implying that they are relatively short overland corridors of rail, road and pipeline infrastructures connecting two ports where the cargo is transshipped. Several dry canals started as portage routes to be either discontinued as they lost their capability to compete, while others were complemented with a canal, such as for Panama. The main disadvantage of dry canals is the load break at both end, which adds costs and delays, as well as limited economies of scale on the overland route. Still, they represent routing options that can incite national imports and exports and the development of logistical activities. Such imprint on regional development is much less evident in canals, since they are simply points of passage.
2. The Suez Canal
The Suez Canal is an artificial waterway of about 190 km in length running across the Isthmus of Suez in northeastern Egypt which connects the Mediterranean Sea with the Gulf of Suez, an arm of the Red Sea. The Suez Canal has no locks, because the Mediterranean Sea and the Gulf of Suez have roughly the same water level and is thus the world's longest canal without locks. It acts as a shortcut for ships between both European and American ports and ports located in southern Asia, eastern Africa, and Oceania. Because of obvious geographical considerations, the maritime route from Europe to the Indian and Pacific oceans must contour the Cape of Good Hope at the southernmost point of the African continent. There are a number of alternatives to the Suez Canal but they involve either very long detours or have limited capacity.
The first canal between the Nile River delta and the Red Sea was excavated around the 13th century BC. Its purpose was to expand trade between the Mediterranean and the Middle East, which became significant by 100 AD. During the next 1,000 years, the canal was neglected, but at different times Egyptian and Roman rulers modified it. Restoration efforts were abandoned in the 8th century AD as the Roman Empire collapsed and Mediterranean trade dropped. Transshipping the goods across the Isthmus was judged more profitable than supporting the maintenance of a canal. This situation endured until the nineteen century when powerful maritime interests saw the need to make a Mediterranean - Red Sea connection again a reality.
The Suez Canal was constructed between 1859 and 1869 by French and Egyptians interests, spearheaded by Ferdinand de Lesseps, with a cost of about 100 million dollars. The opening of the Suez Canal in 1869 brought forward a new era of European influence in Pacific Asia. The journey from Asia to Europe was considerably reduced by saving 6,500 km from the circum African route. In 1874, Great Britain bought the shares of the Suez Canal Company and became its sole owner. According to the Convention of Constantinople signed in 1888, the canal was to be open to vessels of all nations in time of peace or in war. However, Great Britain claimed the need to control the area to maintain its maritime power and colonial interests (namely in South Asia). In 1936, it acquired the right to maintain defense forces along the Suez Canal, which turned out to be of strategic importance during World War II to uphold Asia-Europe supply routes for the Allies.
The second half of the 20th century saw renewed geopolitical instability in the region with the end of colonialism and the emergence of Middle Eastern nationalisms. In 1954 Egypt and Great Britain signed an agreement that superseded the 1936 treaty and provided for the gradual withdrawal of all British troops from the zone. All the British troops were gone by June 1956 as the canal was nationalized by Egypt. This triggered issues with Israel, as Israeli ships were not permitted to cross the canal. This threat was also extended to France and Britain, the former owners of the canal because they refused to help finance the Aswan High Dam project, as initially promised. Israel, France and Britain thus invaded Egypt in 1956. Egypt responded by sinking ships in the canal effectively closing it between 1956 and 1957. An agreement about the usage of the canal was then reached.
However, geopolitical problems persisted as tensions between Israel and neighboring Arab nations increased in the 1960s. The Six Days War between Israel and Egypt and the subsequent invasion of the Sinai Peninsula by Israel caused the closure of the Suez Canal between 1967 and 1975. The closure was so sudden and unexpected that several ships were caught stranded in the canal. The canal became the cease fire line and saw again hostilities during the Yom Kippur War of 1973. The closure of the Suez Canal significantly destabilized international transportation and favored the development of ever larger tankers to use the long circum Africa route. The canal was finally re-opened in 1975 as Egypt agreed to let Israel use it. Significant improvements were made between 1976 and 1980, mainly the widening of the canal to accommodate very large crude carriers (VLCC) of about 200,000 tons supporting the oil trade between Europe and the Middle East. The current capacity of the canal at 240,000 tons means that ultra large crude carriers (ULCC; tankers of more than 300,000 tons) cannot pass through the Canal when fully loaded. A common practice is to unload a share of Mediterranean bound ships and use Sumed pipeline.
With additional deepening and widening projects, the depth of the canal reached 22.5 meters in 2001 and 23.5 meters in 2008. In 2014, a new expansion project that increased the capacity to about 100 transits per day took place. The 'New Suez Canal' was inaugurated in August 2015 at a cost of over 8 billion dollars, expanded the depth to 24 meters (78 feet). This expansion included a new 35 km section enabling the canal to transit ships in both directions at once. The expanded Suez Canal has draft limitations similar to those of the Strait of Malacca. The canal has the capacity to accommodate up to 25,000 ships per year (about 78 per day), but handled about 16,600 in 2013, on average 55 ships per day, which roughly account for 15% of the global maritime trade. A rail line also runs parallel to the canal.
Prior to its expansion in 2015 the canal could only handle unidirectional traffic, with crossings organized into convoys of about 10 to 15 ships. Three convoys per day, two southbound and one northbound, were organized. The transit time were about 17 hours. After the 2015 expansion, two simultaneous convoys per day were organized since a longer section of the canal became bi-directional. Missing a convoy can incur supplementary delays to the point that on occasion maritime shipping companies (particularly for containers) would skip a port call to insure that their ships arrive on time at the Suez Canal to be part of a daily convoy.
The transit rates are established by the Suez Canal Authority (SCA). They are computed to keep the canal transit fees attractive to shippers. In fiscal year 2014, Egypt earned USD 5.3 billion in canal fees making it the country's third largest revenue generator after tourism and remittances from expatriate workers. Container ships account for just under half of the Canal’s traffic and a slightly higher percentage of its net tonnage and revenues. The average canal transit fee per TEU (at 90% vessel utilization) amounts to 102 USD for a vessel of 1,000 TEU down to 56 USD for the largest container vessels. The Far East - Europe trade constitutes about 75% of the traffic handled by Suez. In recent years, services to the North American East Coast coming from Asia and transiting through the Suez Canal have increased to account for more than 15% of the traffic it handles. The canal area has also become a major transshipment cluster.
3. The Panama Canal
The Panama Canal joins the Atlantic and Pacific oceans for 82 kilometers across the Isthmus of Panama, running from Cristobal on Limon Bay, an arm of the Caribbean Sea, to Balboa, on the Gulf of Panama. Since its expansion in 2016, it involves two systems of locks that can both be used at the same time. The old locks, completed in 1914, can handle ships with a draft of 12.2 meters (40 feet), a width of 32 meters (106 feet) and a length of 294 meters (965 feet). The expanded locks, completed in 2016, can handle ships with a draft of 15.2 meters (50 feet), a width of 49 meters (160 feet) and a length of 366 meters (1200 feet). Its initial construction and subsequent expansion rank among the greatest engineering works of all time as the canal prevents a long detour around South America, thus facilitating the maritime flows of world trade. The Panama Canal is of particular strategic importance to the United States as it enables to link the East and the West coast more quickly, saving about 13,000 km (from 21,000 km to 8,000 km) for a maritime journey. It is composed of three main elements, the Gatun Locks (1914) / Agua Clara Locks (2016) giving access to the Atlantic Ocean, the Culebra Cut (Gaillard) crossing the continental divide and the Miraflores and Pedro Miguel Locks (1914) / Cocoli Locks (2016) accessing the Pacific Ocean. The canal handles about 5% of the global seaborne trade and about 12% of the American international seaborne trade. In addition, close to 70% of the traffic handled by the Panama Canal either originates or is bound to the United States.
Interest in establishing a short route between the Atlantic and Pacific began with the exploration of Central America in the early 16th century. In 1534, the Spanish surveyed the Panama region in order to construct a canal, but the project never came into existence due to acute technical constraints. Overland portage routes were used instead, initially as paths through the isthmus, but in 1855 the completion of Panama Railway provided a faster and higher capacity link. The United States became interested in building a canal when gold was discovered in California in 1848. A possible path through Nicaragua was also surveyed. However, in 1878 the French Geographical Society of Paris signed a treaty with Columbia (then the owner of the Province of Panama) for the construction of a canal. From 1879 to 1899, the French Canal Company (Compagnie Universelle du Canal Interoceanique) under the initiative of Ferdinand de Lesseps (who was the key driver behind the construction of the Suez Canal in 1869) undertook construction after capitalizing 1 billion francs from 800,000 private investors. However, the ambitious project failed due mainly to financial problems, tropical diseases (an estimate of 25,000 workers died) and the technical difficulties of trying to build a sea level canal where it could not be realistically done. The resulting crash of the company was estimated to be the largest of the 19th century.
The Spanish-American war of 1898 gave an incentive to build a canal due to the long repositioning of American ships between the Atlantic and Pacific oceans. It is only in the twentieth century that the project would become a reality. Under the rule of Colombia the United States was unsuccessful in attempts to plan a canal. However, in 1903 the Panamanian revolution, supported by the United States, resulted in the independence of Panama. In that same year, the United States and the new state of Panama signed the Hay-Bunau-Varilla Treaty by which the United States guaranteed the independence of Panama and secured a perpetual lease on a 16-km (10 miles) strip for the canal, over which the United States had complete sovereignty. Panama in return got a monetary compensation of $10 million and an inflation-indexed annual compensation.
The Panama Canal was constructed between 1904 and 1914 by American engineers and has a total length of 82 km at a cost of $387 million (including the $10 million compensation to Panama and $40 million to purchase the previous project from the French Canal Company). In 1906, President Theodore Roosevelt, mainly credited for the achievement, put the construction of the canal under the authority of the U.S. Army Corps of Engineers. The Soo Locks linking Lake Huron to Lake Superior, which at the time were the most heavily used in the world, became the engineering template for Panama's locks. The construction of Gatun Dam enabled the creation of an artificial lake (Lake Gatun), which reduced the need for excavation as well a providing a large reservoir of water to supply the locks. A total of 70,000 people worked on the project and about 5,600 died in the process, mainly because of tropical diseases. The work was completed in 1914 and involved excavating 143 million cubic meters of earth and sanitizing the entire canal area, which was infested with mosquitoes that spread yellow fever and malaria.
Since its completion in 1914, more than 1.04 million vessels transited the canal, carrying 11.17 billion tons of cargo (as of 2013). About 13,000 ships transit the canal every year, with an average of 35 ships per day. However, the canal has the optimal capacity to handle 50 ships per day. Using the canal requires in average transit time of about 16.5 hours if the passage has been reserved in advance. With no reservations, the transit takes an average of 35 hours due to the additional time spent waiting for a transit slot. Containers, grains and petroleum account for the dominant share of the cargo transited. The introduction of super-tankers at the beginning of the 1950s forced the reconsideration of its strategic importance as economies of scale in petroleum shipping are limited by the size of the canal. It is synonymous of a standard in maritime transport related to capacity, the Panamax standard, which equals to 65,000 deadweight tons, a draft of 12 meters and a capacity of about 4,500 TEUs depending on the load configuration (about 5,200 TEU if most of the containers are empty).
Under the control of the United States until 1979, its administration was entrusted to the State of Panama by the Panama Canal Treaty of 1977 (also called the Carter-Torrijos Treaty). In December 1999, the canal was reverted to Panama under the jurisdiction of the Panama Canal Authority. The authority generates revenue by collecting tolls on all ships crossing the canal and is responsible for the operation and maintenance of the facility. A loaded ship pays about $2.57 per net ton and the average toll is about $45,000. For container ships the toll (as of 2011) was $74 per TEU of capacity on laden containers and $65.60 per TEU of capacity on ships with empty containers. In 2008, $1.32 billion in tolls were collected, of which 54% were generated by container shipping.
In 1999, the Hong Kong terminal operator, Hutchison Port Holdings (HPH), was granted a 25 years concession for the operation of port terminals on both the Atlantic (Port of Cristobal) and Pacific (Port of Balboa) sides of the Canal. This raised concerns within the American government as it was perceived that the control of the canal was falling into foreign interests shortly after it was handed back to Panama. The rail line between the Atlantic and Pacific sides was reopened in 2002 to handle the growing containerized traffic. The Panama Canal Railway Company (concession to KCS and Mi-Jack Products), offers an alternative to the size limitations of the canal and supports transshipment activities between the Atlantic and the Pacific sides through doublestack services. The same rationale applies to oil circulation with the trans-panama pipeline that resumed its operations in 2003, but the additional capacity this pipeline conveys is only about 1 Mb/d.
In spite of being a century old, the Panama Canal remains a critical bottleneck in global trade. The continuous growth of global trade since the 1990s has placed additional pressures on the Panama Canal to handle a growing number of ships in a timely and predictable manner. This raised concerns that the existing canal would reach capacity by the second decade of the 21st century. Because of these capacity limits, many shipping companies have changed the configuration of their routes. This became increasingly apparent as a growing share of the global containership fleet reached a size beyond the capacity of the Panama Canal, which came to be known as "post-panamax" containerships. Through economies of scale, they offer significant operational costs advantages that cannot be exploited by the existing canal. The increasing usage of those ships along the Pacific Asia / Suez Canal / Mediterranean routes as well as the development of the North American rail landbrige have created a substantial competition to the canal as an intermediate location in global maritime shipping. There are thus a range of alternatives to the Panama Canal trade routes, with the North American landbridges being the most salient. Yet, concerns about the reliability of the landbridge connection incited the setting of "all-water routes" linking directly Pacific Asia and the American East Coast, particularly in light of the booming China-United States trade relation.
A decision to expand the Panama Canal was reached in 2006 by the Panamanian government. The expansion was a 5.4 billion US dollars project that involved building a new set of locks on both the Atlantic and Pacific sides of the canal, which would accommodate ships up to 12,500 TEU depending on their load configuration. The dredging of access channels as well as the widening of several sections of the existing canal was also required. This allows Aframax and Suezmax vessels to pass through the canal, thus permitting new opportunities for container shipping services such as the re-emergence of round-the-world services. Essentially, a new containership class will be created to add to the existing Panamax ship class. It will be dubbed New-Panamax (or Neo Panamax; NPX).
The new locks complement the existing lock systems, creating a two tier service; one for the very large ships and the other for Panamax, or smaller, ships. The outcome allows about 12 ships per day in the new lock system to be added to the existing capacity of about 45 ships per day in the existing locks. The additional capacity is however constrained by the fact that the new locks are unidirectional compared with the existing double locks. The new infrastructures came online in July 2016, after some delays since initially the expansion was expected to be completed for 2014. However, this expansion is taking place in an environment of notable commercial changes such a revision of sourcing strategies and the possibility of building a competing canal in Nicaragua. Further, the latest generation of containerships (such as the Triple E class) has reached sizes that are beyond the expanded locks. Within the foreseeable future the expanded Panama Canal will still be able to handle 95% of the global containership capacity. As a global intermediary location, Panama is shifting from being a point of transit towards being a logistics cluster and a trade platform for the Americas.
4. The Strait of Malacca
The Strait of Malacca is one of the most important strategic passages of the World because it supports the bulk of the maritime trade between Europe and Pacific Asia, which accounts for 50,000 ships per year. About 30% of the world’s trade and 80% of Japan’s, South Korea’s and Taiwan’s imports of petroleum transits through the strait, which involved approximately 15.2 Mbd in 2013. It is the main passage between the Pacific and the Indian oceans with the strait of Sunda (Indonesia) being the closest existing alternative. It measures about 800 km in length, has a width between 50 and 320 km (2.5 km at its narrowest point) and a minimal channel depth of 23 meters (about 70 feet). It represents the longest strait in the world used for international navigation and can be transited in about 20 hours.
Traditionally, the Strait was an important passage point between the Chinese and the Indian worlds and was controlled at different points in time by Javanese and Malaysian kingdoms. From the 14th century, the region came under the control of Arab merchants who established several fortified trading towns, Malacca being the most important commercial center in Southeast Asia. Again, the control of the trade route shifted as the era of European expansion began in the 16th century. In 1511, Malacca fell to the Portuguese and this event marked the beginning of European control over the Strait. In 1867, England took control of the passage with Singapore as a main harbor and other important centers such as Malacca and Penang, forming the Strait Settlements. This control lasted until the Second World War and the independence of Malaysia in 1957. As Pacific trade increased considerably after the Second World War, so did the importance of the passage. Singapore, located at the southern end of the Strait of Malacca is one of the most important ports in the world and a major oil refining center.
One of the main challenges facing the Strait of Malacca is that it requires some dredging, since it is barely deep enough to accommodate ships above 300,000 deadweight tons. The Strait being between Malaysia, Indonesia and Singapore, an agreement is difficult to reach about how the dredging costs should be shared and how fees for its usage should be levied. Political stability and piracy along are also major issues for the safety of maritime circulation, especially on the Indonesian side with the province of Aceh, which has experienced political instability.
The Strait of Malacca ends up in the South China Sea, another extremely important shipping lane and a region subject to contention since oil and natural gas resources are present. The Spartly and Paracel groups of islands are claimed in whole or in part by China, Vietnam, Malaysia, Indonesia, Brunei and the Philippines. The region has proven oil reserves estimated at about 7.0 Bb with oil production accounting for 2.5 Mb/d. With the substantial economic growth taking place in the region large flows of oil, liquefied natural gas and other raw materials (iron ore, coal) are transiting towards East Asia. About 25% of the global shipping fleet transits through the region each year, underlining the importance of the South China Sea as an extension of the Malacca chokepoint. Still, the potential for disruptions of trade routes in the South China Sea must take account of the high level of reliance China has on such routes and thus has limited interest in seeing them compromised.
Using the Kra Isthmus in Thailand as a shortcut between the Gulf of Thailand (Pacific Ocean) and the Andaman Sea (Indian Ocean) has been considered as early as in the 17th century. The Kra Canal project aims at building a 102 km long canal along the narrowest segment of the Kra Isthmus. By avoiding a detour through the Strait of Malacca, the potential canal could reduce shipping distance by 1,200 km, which corresponds to about 5 shipping days (such figures do not take account of canal transit times). Although the project represents a shortcut, this benefit is rather marginal, particularly for long distance shipping routes and due to the importance of Singapore and Tanjung Pelepas as major transshipment hubs linking Asia / Oceania / Europe trade routes. The canal would mainly benefit Thailand, Burma, Cambodia and Vietnam as they would see more significant shipping time and cost reductions for their maritime trade. China is pursuing this project for both commercial and strategic reasons, since it will give it an additional option to the usage of the Strait of Malacca.
5. The Strait of Hormuz
The Strait of Hormuz forms a strategic link between the oil fields of the Persian Gulf, which is a maritime dead-end, the Gulf of Oman and the Indian Ocean. It has a width between 48 and 80 km, but navigation is limited to two 3 km wide channels, each exclusively used for inbound or outbound traffic. Circulation in and out of the Persian Gulf is thus highly constrained, namely because the sizable amount of tanker and containership traffic makes navigation difficult along the narrow channels. In addition, islands that insure the control of the strait are contested by Iran and the United Arab Emirates. The strait is deep enough to accommodate all the existing tanker classes.
The security of the strait has been often compromised and its commercial usage has been the object of contentions. Between 1984 and 1987 a “Tanker War” took place between Iran and Iraq, where each belligerent (Iran-Iraq War of 1980-1988) began firing on tankers, even neutrals, bound for their respective ports. Shipping in the Persian Gulf dropped by 25%, forcing the intervention of the United States to secure the oil shipping lanes. About 85% of all the petroleum exported from the Persian Gulf transits through the Strait of Hormuz and bound to Asian markets. Its importance for global oil circulation cannot be overstated. For instance, 75% of all Japanese oil imports transit through the strait. There are thus very few alternatives to oil exports if the traffic of about 17 million barrels per day going through Hormuz was compromised.
While the Persian Gulf has conventionally been centered on the production and distribution of oil, the growth of container shipping has also expanded its commercial importance. For instance, Dubai ranked in 2014 as the world's 9th largest container port with a traffic of 15.2 million TEU and can only be accessed through the Strait of Hormuz. It has become a major transshipment hub linking major Asian, Middle Eastern and East African trade routes. Consequently, compromising circulation through the Strait of Hormuz would impair global oil trade as well as commercial trade along Europe / Asia routes.
6. Other Important Passages
  • The Strait of Bab el-Mandab is controlling access to the Suez Canal, a strategic link between the Indian Ocean and the Red Sea. It has between 48 and 80 km of width, but navigation is limited to two 3 km wide channels for inbound and outbound traffic. The sizable amount of tanker traffic makes navigation difficult along the narrow channels. A closing of this strait would have serious consequences, forcing a detour around the Cape of Good Hope and in the process demanding additional tanker space. Like the Strait of Malacca, Bal el-Mandab is a crucial link in the Europe - Asia trade route.
  • The Oresund Strait. A passage of 115 km between Denmark and Sweden connecting the North Sea and the Baltic, which is a maritime dead-end. It enables Russia, the Baltic States, Poland and Germany to access international maritime shipping.
  • The Strait of Gibraltar. As a peninsula between the Atlantic and the Mediterranean oceans, Gibraltar represents an obligatory passage point between these two oceans. The strait is about 64 km long and varies in width from 13 to 39 km. Under British control since its conquest from Spain in 1704 and its formal cession by the treaty of Utrecht (1713). During the Second World War, Gibraltar blocked the access to the Atlantic to the Italian and German fleets of the Mediterranean, which represented a major strategic stronghold. The Strait has become an important transshipment nexus along major Europe / Mediterranean / Asia shipping routes.
  • The Strait of Bosporus. The Passage of Bosporus has a length of 30 km by of width of only 1 km at its narrowest point linking the Black Sea to the Mediterranean Ocean. Its access was the object of two conflicts, the War of Crimea (1854) and the battle of the Dardanelles (Gallipoli, 1915). The passage was fortified by Turkey after the Convention of Montreux in 1936 which recognized its control of Bosporus but granted free passage in peace time to any commercial vessel without inspection. With the passage of the Dardanelles, Bosporus forms the only link between the Black Sea and the Mediterranean Ocean. In the current context, Bosporus represents a passage of growing strategic importance, notably after the fall of the Soviet Union. The Caspian Sea has vast oil reserves and a large amount of it must transit trough the Black Sea and Bosporus to reach external markets, namely around the Mediterranean Ocean. Although pipelines offer an alternative, the cost differentials are clearly advantaging the use of maritime transportation. For instance, the cost of moving oil along the Baku – Ceyhan pipeline ranges between $1 and $2 per barrel while shipping oil by tankers through the Black Sea costs 20 cents per barrel. About 50,000 ships, including 5,500 tankers, are transiting through the passage each year, which is getting close to capacity. Further, due to its sinuosity, Bosporus is one of the most difficult passage to navigate, particularly for larger ships. Oil transiting through the Bosporus has growth substantially in recent years with the exploitation of oil fields around the Caspian Sea and about 2.9 Mb/d were transiting through the passage in 2013. The future growth of petroleum circulation through Bosporus is thus highly problematic, notably the risk of collisions and oil spills in the midst of Istanbul. In 2002, the Turkish government forbade the use of the passage during the night by large tankers.
  • The Strait of Magellan. Discovered in 1520 by the Portuguese explorer Ferdinand Magellan. Separates South America to Tierra del Fuego. It is 530 km long and 4 to 24 km of width. Held secret during more than one century to assure the supremacy of Portugal and Spain for the Asian trade of spices and silk. With the construction of the Panama Canal in 1916 and later on the setting up of the North American transcontinental bridge in the 1980s, this passage has lost most of its strategic importance.
  • The Cape Good Hope. Extreme tip of Africa discovered by the Portuguese at the end of the fifteenth century. It separates the Atlantic and Indian oceans. It took its name because of the fact that it offered a maritime passage towards India and Asia, thus the hope of a fortune for the one who passed it. Vasco de Gamma got around it in 1497 and was the first European to reach India by sea. Since the widening of the Suez Canal in the 1970s, the Cape of Good Hope has lost some of its strategic importance but still remain an important passage. Still, the growth of trade relations between Latin America and East, South and Southeast Asia has incited the growing use the Cape route and of South Africa as a transshipment hub.