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The Dardanelles ( ; ; ), also known as the Strait of Gallipoli (after the Gallipoli peninsula) and in classical antiquity as the Hellespont ( ; ), is a narrow, natural strait and internationally significant waterway in northwestern Turkey that forms part of the continental boundary between Asia and Europe and separates Asian Turkey from European Turkey. Together with the Bosporus, the Dardanelles forms the Turkish Straits.
One of the world's narrowest straits used for international navigation, the Dardanelles connects the Sea of Marmara with the Aegean Sea and Mediterranean seas while also allowing passage to the Black Sea by extension via the Bosporus. The Dardanelles is long and wide. It has an average depth of with a maximum depth of at its narrowest point abreast the city of Çanakkale. The first fixed crossing across the Dardanelles opened in 2022 with the completion of the 1915 Çanakkale Bridge.
Most of the northern shores of the strait along the Gallipoli peninsula () are sparsely settled, while the southern shores along the Troad peninsula () are inhabited by the city of Çanakkale's urban population of 110,000.
The English name Dardanelles is an abbreviation of Strait of the Dardanelles. During Ottoman times there was a castle on each side of the strait. These castles together were called the Dardanelles, probably named after Dardanus, an ancient city on the Asian shore of the strait which in turn was said to take its name from Dardanus, the mythical son of Zeus and Electra. The name comes from the Dardani in the Balkans, according to Papazoglu.Papazoglu, F. (1978). The Central Balkan Tribes in Pre-Roman Times: Triballi, Autariatae, Dardanians, Scordisci and Moesians. Niederlande: Hakkert, p. 132
The ancient Greek language name Ἑλλήσποντος (Hellēspontos) means "Sea of Helle", and was the ancient name of the narrow strait. It was variously named in classical literature Hellespontium Pelagus, Rectum Hellesponticum, and Fretum Hellesponticum. It was so called from Helle, the daughter of Athamas, who was drowned here in the mythology of the Golden Fleece.
The strait is located at approximately .
The Dardanelles is unique in many respects. The very narrow and winding shape of the strait is more akin to that of a river. It is considered one of the most hazardous, crowded, difficult and potentially dangerous waterways in the world. The currents produced by the tidal action in the Black Sea and the Sea of Marmara are such that ships under sail must wait at anchorage for the right conditions before entering the Dardanelles.
Herodotus says that, circa 482 BC, Xerxes I (the son of Darius) had two built across the width of the Hellespont at Abydos, in order that his huge army could cross from Persia into Ancient Greece. This crossing was named by Aeschylus in his tragedy The Persians as the cause of divine intervention against Xerxes.
According to Herodotus (vv.34), both bridges were destroyed by a storm and Xerxes had those responsible for building the bridges beheaded and the strait itself whipped. The Histories of Herodotus vii.33–37 and vii.54–58 give details of building and crossing of Xerxes' Pontoon Bridges. Xerxes is then said to have thrown fetters into the strait, given it three hundred lashes with multiple whips and branded it with red-hot irons as the soldiers shouted at the water.
Herodotus commented that this was a "highly presumptuous way to address the Hellespont" but in no way atypical of Xerxes. (vii.35)
Harpalus the engineer is said to have eventually helped the invading armies to cross by lashing the ships together with their bows facing the current and adding two additional anchors to each ship.
From the perspective of ancient Greek mythology Helle, the daughter of Athamas, supposedly was drowned at the Dardanelles in the legend of the Golden Fleece. Likewise, the strait was the scene of the legend of Hero and Leander, wherein the lovesick Leander swam the strait nightly in order to tryst with his beloved, the priestess Hero, but was ultimately drowned in a storm.
Also, the Dardanelles was an important source of income for the ruler of the region. At the Istanbul Archaeological Museum a marble plate contains a law by the Byzantine Emperor Anastasius I (491–518 AD), that regulated fees for passage through the customs office of the Dardanelles. Translation:
... Whoever dares to violate these regulations shall no longer be regarded as a friend, and he shall be punished. Besides, the administrator of the Dardanelles must have the right to receive 50 golden Litrons, so that these rules, which we make out of piety, shall never ever be violated... ... The distinguished governor and major of the capital, who already has both hands full of things to do, has turned to our lofty piety in order to reorganize the entry and exit of all ships through the Dardanelles... ... Starting from our day and also in the future, anybody who wants to pass through the Dardanelles must pay the following:
– All wine merchants who bring wine to the capital (Constantinopolis), except , have to pay the Dardanelles officials 6 follis and 2 sextarius of wine.
– In the same manner, all merchants of olive-oil, vegetables and lard must pay the Dardanelles officials 6 follis. Cilician sea-merchants have to pay 3 follis and in addition to that, 1 keration (12 follis) to enter, and 2 keration to exit.
– All wheat merchants have to pay the officials 3 follis per modius, and a further sum of 3 follis when leaving.
Since the 14th century the Dardanelles have almost continuously been controlled by the Turks.
Ottoman control of the strait continued largely without interruption or challenges until the 19th century, when the Empire started its decline.
In 1833, following the Ottoman Empire's defeat in the Russo-Turkish War of 1828–1829, Russia pressured the Ottomans to sign the Treaty of Hunkiar Iskelesi—which required the closing of the straits to warships of non-Black Sea powers at Russia's request. That would have effectively given Russia a free hand in the Black Sea.
This treaty alarmed the Ottoman Empire, who were concerned that the consequences of potential Russian expansionism in the Black Sea and Mediterranean regions could conflict with their own possessions and economic interest in the region. At the London Straits Convention in July 1841, the United Kingdom, France, Austria, and Prussia pressured Russia to agree that only Turkish warships could traverse the Dardanelles in peacetime. The United Kingdom and France subsequently sent their fleets through the straits to defend the Danube front and to attack the Crimean Peninsula during the Crimean War of 1853–1856 – but they did so as allies of the Ottoman Empire. Following the defeat of Russia in the Crimean War, the Congress of Paris in 1856 formally reaffirmed the London Straits Convention.
The Turks mined the straits to prevent Allied ships from penetrating them but, in minor actions two submarines, one British and one Australian, did succeed in penetrating the minefields. The British submarine sank an obsolete Turkish pre-dreadnought battleship off the Golden Horn of Istanbul. Sir Ian Hamilton's Mediterranean Expeditionary Force failed in its attempt to capture the Gallipoli peninsula, and the British cabinet ordered its withdrawal in December 1915, after eight months' fighting. Total Allied deaths included 41,000 British and Irish, 15,000 French, 8,700 Australians, 2,700 New Zealanders, 1,370 Indians and 49 Newfoundlanders. Total Turkish deaths were around 60,000.
Following the war, the 1920 Treaty of Sèvres demilitarized the strait and made it an international territory under the control of the League of Nations. The Ottoman Empire's non-ethnically Turkish territories were broken up and partitioned among the Allied Powers, and Turkish jurisdiction over the Turkish Straits curbed.
As part of its national security strategy, Turkey eventually rejected the terms of the treaty, and subsequently remilitarized Turkish Straits area over the following decade. Following extensive diplomatic negotiations, the reversion was formalized under the Montreux Convention Regarding the Regime of the Turkish Straits on 20 July 1936. That convention, which is still in force today, treats the straits as an international shipping lane while allowing Turkey to retain the right to restrict the naval traffic of non-Black Sea states.
During World War II, through February 1945, when Turkey was neutral for most of the length of the conflict, the Dardanelles were closed to the ships of the belligerent nations. Turkey declared war on Germany in February 1945, but it did not employ any offensive forces during the war.
In July 1946, the Soviet Union sent a note to Turkey proposing a new régime for the Dardanelles that would have excluded all nations except the Black Sea powers. The second proposal was that the straits should be put under joint Turkish-Soviet defence. This meant that Turkey, the Soviet Union, Bulgaria and Romania would be the only states having access to the Black Sea through the Dardanelles. The Turkish government however, under pressure from the United States, rejected these proposals.
Turkey joined NATO in 1952, thus affording its straits even more strategic importance as a commercial and military waterway.
In more recent years, the Turkish Straits have become particularly important for the oil industry. Russian oil, from ports such as Novorossyisk, is exported by tankers primarily to western Europe and the U.S. via the Bosporus and the Dardanelles straits.
The Dardanelles were closed in late February 2022 to all foreign warships at the beginning of the Russian invasion of Ukraine in accordance with the Montreux Convention.
The strait also experiences significant amounts of commercial shipping traffic.
Both subsea power lines cross 4 optical fibre data lines laid earlier along the strait. A published map shows communication lines leading from Istanbul into the Mediterranean, named MedNautilus and landing at Athens, Sicily and elsewhere.
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