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119-566: Originally some 56 km (35 mi) long, it stretches from Evcik İskelesi in Çatalca at the Black Sea coast across the Thracian peninsula to the coast of the Sea of Marmara at 6 km (3.7 mi) west of Silivri (ancient Selymbria). It ran from north to south through the locations what are today Karacaköy, Gümüşpınar, Pınarca, Kurfallı, Fener, Alipaşa Neighborhood and Silivri Altınorak. Remains of

238-514: A halocline that stops at the Cold Intermediate Layer (CIL). This layer is composed of cool, salty surface waters, which are the result of localized atmospheric cooling and decreased fluvial input during the winter months. It is the remnant of the winter surface mixed layer. The base of the CIL is marked by a major pycnocline at about 100–200 metres (330–660 ft), and this density disparity

357-654: A bold attempt to capture the sultan, earning the sobriquet Warneńczyk ( of Varna in Polish; he is also known as Várnai Ulászló in Hungarian or Ladislaus Varnensis in Latin). The failure of the Crusade of Varna made the fall of Constantinople to the Ottomans in 1453 all but inevitable, and Varna (with all of Bulgaria) was to remain under Ottoman domination for over four centuries. Today, there

476-406: A building of Roman thermae from the 5th century AD. Major athletic games were held every five years, possibly attended by Gordian III in 238. The main aqueduct of Odessos was recently discovered during rescue excavations north of the defensive wall. The aqueduct was built in three construction periods between the 4th and the 6th centuries; in the 4th century the aqueduct was built together with

595-579: A busy hub for European imports to the capital; 12 foreign consulates opened in the city. Local Bulgarians took part in the National Revival ; Vasil Levski set up a secret revolutionary committee. In 1878, the city, which had 26,000 inhabitants, was given to Bulgaria by Russian troops, who entered on 27 July. Varna became a front city in the First Balkan War and the First World War ; its economy

714-537: A coastline on the sea, its drainage basin includes parts of 24 countries in Europe. The Black Sea, not including the Sea of Azov , covers 436,400 km (168,500 sq mi), has a maximum depth of 2,212 m (7,257 ft), and a volume of 547,000 km (131,000 cu mi). Most of its coasts ascend rapidly. These rises are the Pontic Mountains to the south, bar the southwest-facing peninsulas,

833-604: A decrease in the flux of silicon associated with advection across isopycnal surfaces. This phenomenon demonstrates the potential for localized alterations in Black Sea nutrient-input to have basin-wide effects. Varna, Bulgaria Varna ( Bulgarian : Варна , pronounced [ˈvarnɐ] ) is the third-largest city in Bulgaria and the largest city and seaside resort on the Bulgarian Black Sea Coast and in

952-707: A fire. A British and a French monument mark the cemeteries where cholera victims were interred. In 1866, the first railroad in Bulgaria connected Varna with the Rousse on the Danube, linking the Ottoman capital Constantinople with Central Europe; for a few years, the Orient Express ran through that route. The port of Varna developed as a major supplier of food—notably wheat from the adjacent breadbasket Southern Dobruja —to Constantinople and

1071-407: A key role in the development of Cyrillic script by Bulgarian scholars under the guidance of one of Saints Cyril and Methodius ' disciples. Karel Škorpil suggested that Boris I may have been interred there. The synthetic culture with Hellenistic Thracian, Roman, as well as eastern—Armenian, Syrian, Persian—traits that developed around Odessos in the 6th century under Justinian I, may have influenced

1190-465: A limited garrison , and also because the wall was not sufficiently strong due to its hasty construction. The wall fell into ruin after it was abandoned in the 7th century because of the difficulty of keeping it manned and repaired. Over the centuries, the stone of more than half of the total length was reused in other local buildings. It is best preserved in the woodlands of the northern sector. Black Sea Unrecognised states: The Black Sea

1309-528: A major grain-producing and viticulture centre, seat of the nation's oldest institution of higher learning outside Sofia, a popular venue for international festivals and events, and the country's de facto summer capital with the erection of the Euxinograd royal summer palace (currently, the Bulgarian government convenes summer sessions there). Mass tourism emerged since the late 1950s. Heavy industry and trade with

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1428-484: A marked vertical stratification and a warm, shallow mixed layer. Day length and insolation intensity also control the extent of the photic zone . Subsurface productivity is limited by nutrient availability, as the anoxic bottom waters act as a sink for reduced nitrate , in the form of ammonia . The benthic zone also plays an important role in Black Sea nutrient cycling, as chemosynthetic organisms and anoxic geochemical pathways recycle nutrients which can be upwelled to

1547-411: A mild climate influenced by the sea with long, mild, akin to Mediterranean, autumns, and sunny and hot, yet considerably cooler than Mediterranean summers moderated by breezes and regular rainfall. Although Varna receives about two-thirds of the average rainfall for Bulgaria, abundant groundwater keeps its wooded hills lush throughout summer. The city is cut off from north and northeast winds by hills along

1666-648: A peace treaty between Theodosius II and Attila was conducted at Odessos. In 513, it became a focal point of the Vitalian revolt. In 536, Justinian I made it the seat of the Quaestura exercitus ruled by a prefect of Scythia or quaestor Justinianus and including Lower Moesia, Scythia , Caria, the Aegean Islands and Cyprus; later, the military camp outside Odessos was the seat of another senior Roman commander, magister militum per Thracias . It has been suggested that

1785-569: A strongly stratified vertical structure. Because of the extreme stratification, it is classified as a salt wedge estuary . Inflow from the Mediterranean Sea through the Bosporus and Dardanelles has a higher salinity and density than the outflow, creating the classic estuarine circulation. This means that the inflow of dense water from the Mediterranean occurs at the bottom of the basin while

1904-433: A threat to health—and perhaps even life—for people living on the Black Sea coast. There have been isolated reports of flares on the Black Sea occurring during thunderstorms, possibly caused by lightning igniting combustible gas seeping up from the sea depths. The Black Sea supports an active and dynamic marine ecosystem, dominated by species suited to the brackish , nutrient-rich, conditions. As with all marine food webs,

2023-516: A very thick convective bottom layer. The Black Sea undersea river is a current of particularly saline water flowing through the Bosporus Strait and along the seabed of the Black Sea. The discovery of the river, announced on August 1, 2010, was made by scientists at the University of Leeds and is the first of its kind to be identified. The undersea river stems from salty water spilling through

2142-443: A weaker mixed assemblage of community development below the seasonal thermocline during summer months, and surface-intensified autumn production. This pattern of productivity is augmented by an Emiliania huxleyi bloom during the late spring and summer months. Since the 1960s, rapid industrial expansion along the Black Sea coastline and the construction of a major dam on the Danube have significantly increased annual variability in

2261-538: Is Todor Balabanov ( GERB ). Varna regional court is one of the busiest courts in the country. The city also headquarters the district, administrative, and military court, and a court of appeal as well as regional, military, and appellate prosecutor's offices. The city is divided by law into five boroughs ( Bulgarian : райони , romanized :  rayoni ), each with its mayor and council: Asparuhovo , Mladost, Odessos (the historic centre), Primorski (the largest one with official population of 102,000 also comprising

2380-575: Is a cenotaph of Ladislaus III in Varna. A major port, agricultural, trade and shipbuilding centre for the Ottoman Empire in the 16th and 17th centuries, preserving a significant and economically active Bulgarian population, Varna was later made one of the Quadrilateral Fortresses (along with Rousse , Shumen, and Silistra ) severing Dobruja from the rest of Bulgaria and containing Russia in

2499-608: Is a marginal mediterranean sea lying between Europe and Asia , east of the Balkans , south of the East European Plain , west of the Caucasus , and north of Anatolia . It is bounded by Bulgaria , Georgia , Romania , Russia , Turkey , and Ukraine . The Black Sea is supplied by major rivers, principally the Danube , Dnieper and Dniester . Consequently, while six countries have

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2618-718: Is divided into two depositional basins—the Western Black Sea and Eastern Black Sea—separated by the Mid-Black Sea High, which includes the Andrusov Ridge, Tetyaev High, and Archangelsky High, extending south from the Crimean Peninsula . The basin includes two distinct relict back-arc basins which were initiated by the splitting of an Albian volcanic arc and the subduction of both the Paleo - and Neo- Tethys oceans, but

2737-702: Is generally accepted to be a rendering of the Iranian word * axšaina- ("dark colored"). Ancient Greek voyagers adopted the name as Á-xe(i)nos , identified with the Greek word áxeinos (inhospitable). The name Πόντος Ἄξεινος Póntos Áxeinos (Inhospitable Sea), first attested in Pindar ( c.  475 BC ), was considered an ill omen and was euphemized to its opposite, Εὔξεινος Πόντος Eúxeinos Póntos (Hospitable Sea), also first attested in Pindar. This became

2856-720: Is referred to as the maritime capital of Bulgaria and has the headquarters of the Bulgarian Navy and merchant marine. In 2008, Varna was designated as the seat of the Black Sea Euroregion by the Council of Europe . In 2014, Varna was awarded the title of European Youth Capital 2017. The oldest gold treasure in the world, belonging to the Varna culture , was discovered in the Varna Necropolis and dated to 4600–4200 BC. Since

2975-580: Is subject to interannual variability. Outside of the Rim Current, numerous quasi-permanent coastal eddies are formed as a result of upwelling around the coastal apron and "wind curl" mechanisms. The intra-annual strength of these features is controlled by seasonal atmospheric and fluvial variations. During the spring, the Batumi eddy forms in the southeastern corner of the sea. Beneath the surface waters—from about 50 to 100 metres (160 to 330 ft)—there exists

3094-569: Is the tumulus dated 8th–7th c. BC found near Belogradets , Varna Province. The region around Odessos was densely populated with Thracians long before the coming of the Greeks on the west seashore of the Black Sea. Pseudo-Scymnus writes: "...Around the city [Odessos] lives the Thracian tribe named Crobises." This is also evidenced by various ceramic pottery, made by hand or by a Potter's wheel , bronze ornaments for horse-fittings and iron weapons, all found in Thracian necropolises dated 6th–4th c. BC near

3213-454: Is the major mechanism for isolation of the deep water. Below the pycnocline is the Deep Water mass, where salinity increases to 22.3 PSU and temperatures rise to around 8.9 °C (48.0 °F). The hydrochemical environment shifts from oxygenated to anoxic, as bacterial decomposition of sunken biomass utilizes all of the free oxygen. Weak geothermal heating and long residence time create

3332-437: Is very close to the Thracian style, a possible explanation for the frequent mixture of both folks in northeastern Thrace. Many bronze artefacts give testimony for such process, for example, applications and front plates for horseheads, as well as moulds for such products in nearby and more distanced settlements. Since the 4th c. BC the region had been populated by more Getae , which is a Thracian tribe populating both shores around

3451-602: The Periplus of Pseudo-Scylax ; and as Odyssos or Odyssus in the Synecdemus and in Procopius . It was established in the second quarter of the sixth century BC (585–550 BC) by Miletian Greeks on the site of a previous Thracian settlement. The Miletian founded an apoikia (trading post) of Odessos towards the end of the 7th c. BC (the earliest Greek archaeological material is dated 600–575 BC), or, according to Pseudo-Scymnus , in

3570-570: The Bosporus ) Burgas , Varna , Constanța , Odesa , Sevastopol , Novorossiysk , Sochi , Poti , Batumi , Trabzon and Samsun . The Black Sea has a positive water balance , with an annual net outflow of 300 km (72 cu mi) per year through the Bosporus and the Dardanelles into the Aegean Sea . While the net flow of water through the Bosporus and Dardanelles (known collectively as

3689-713: The Caucasus Mountains to the east, and the Crimean Mountains to the mid-north. In the west, the coast is generally small floodplains below foothills such as the Strandzha ; Cape Emine , a dwindling of the east end of the Balkan Mountains ; and the Dobruja Plateau considerably farther north. The longest east–west extent is about 1,175 km (730 mi). Important cities along the coast include (clockwise from

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3808-833: The Danube (northern Serbia, northern Bulgaria ( Danubian Plain ) and southern Romania ( Wallachian Plain ) to northeast Ukraine and further across the Central Black Earth Region and southern Russia into Siberia . The littoral zone of the Black Sea is often referred to as the Pontic littoral or Pontic zone . The largest bays of the Black Sea are Karkinit Bay in Ukraine; the Gulf of Burgas in Bulgaria; Dnieprovski Bay and Dniestrovski Bay, both in Ukraine; and Sinop Bay and Samsun Bay, both in Turkey. The largest rivers flowing into

3927-526: The Danube Delta . Celts started populating the region after their invasion of the Balkan peninsula in 280 BC. All over northeast Bulgaria and even near Odessos were found a significant number of bronze items with Celtic ornaments and typical weapons, all quickly adopted by Thracians. Arkovna, 80 km near Odessos, was probably the permanent capital of Celts' last king Kavar (270/260–216/210 BC). Probably after

4046-469: The Mediterranean Sea . These links were reflected in some local productions, for example, forms of bronze fibula of the age, either imported or locally made. There is no doubt that interactions occurred mostly by sea and the bay of Odessos is one of the places where the exchanges took place. Some scholars consider that during the 1st millennium BC, the region was also settled by the half-mythical Cimmerians . An example of their, probably accidental, presence,

4165-730: The North Atlantic oscillation , the climatic mechanisms resulting from the interaction between the north Atlantic and mid-latitude air masses. While the exact mechanisms causing the North Atlantic Oscillation remain unclear, it is thought the climate conditions established in western Europe mediate the heat and precipitation fluxes reaching Central Europe and Eurasia, regulating the formation of winter cyclones , which are largely responsible for regional precipitation inputs and influence Mediterranean sea surface temperatures (SSTs). The relative strength of these systems also limits

4284-507: The Northern Bulgaria region. Situated strategically in the Gulf of Varna , the city has been a major economic, social and cultural centre for almost three millennia. Historically known as Odessos ( Ancient Greek : Ὀδησσός ), Varna developed from a Thracian seaside settlement into a major seaport on the Black Sea . Varna is an important centre for business, transportation, education, tourism, entertainment, and healthcare. The city

4403-507: The Russo-Turkish wars . The Russians temporarily took over the city in 1773 and again in 1828, following the prolonged Siege of Varna , returning it to the Ottomans two years later after the medieval fortress was razed. In the early 19th century, many local Greeks joined the patriotic organisation Filiki Eteria . Αt the outbreak of the Greek War of Independence (1821) revolutionary activity

4522-614: The Santonian . Since its initiation, compressional tectonic environments led to subsidence in the basin, interspersed with extensional phases resulting in large-scale volcanism and numerous orogenies , causing the uplift of the Greater Caucasus , Pontides , southern Crimean Peninsula and Balkanides mountain ranges. During the Messinian salinity crisis in the neighboring Mediterranean Sea , water levels fell but without drying up

4641-505: The Turkish Straits ) is out of the Black Sea, water generally flows in both directions simultaneously: Denser, more saline water from the Aegean flows into the Black Sea underneath the less dense, fresher water that flows out of the Black Sea. This creates a significant and permanent layer of deep water that does not drain or mix and is therefore anoxic . This anoxic layer is responsible for

4760-515: The hinterland . Excavations at nearby Thracian sites have shown uninterrupted occupation from the 7th to the 4th century BC and close commercial relations with the colony. The Greek alphabet has been used for inscriptions in Thracian since at least the 5th century BC. Odessos was included in the assessment of the Delian league of 425 BC. In 339 BC, it was unsuccessfully besieged by Philip II (priests of

4879-481: The "Varna- Devnya - Provadiya agglomeration" is not considered identical to the "Varna metro area". Varna is one of the few cities in Bulgaria with a positive natural growth (6300 births vs. 3600 deaths in 2009 ) and new children's day care centers opening (6 expected in 2009). Since December 2006, various sources, including the Bulgarian National Television , national newspapers, research agencies,

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4998-576: The 10th Olympic Congress took place in the Palace of Culture and Sports . Varna became a popular resort for Eastern Europeans, who were barred from travelling to the West until 1989. One of them, the veteran East German communist Otto Braun , died on a vacation in Varna in 1974. The city occupies 238 km (92 sq mi) on verdant terraces (Varna monocline of the Moesian Platform ) descending from

5117-576: The 13th century. A 1570 map Asiae Nova Descriptio from Abraham Ortelius 's Theatrum Orbis Terrarum labels the sea Mar Maggior (Great Sea), compare Latin Mare major . English writers of the 18th century often used Euxine Sea ( / ˈ j uː k s ɪ n / or / ˈ j uː k ˌ s aɪ n / ). During the Ottoman Empire , it was called either Bahr-e Siyah ( Perso-Arabic ) or Karadeniz ( Ottoman Turkish ), both meaning "Black Sea". The International Hydrographic Organization defines

5236-472: The 17th century operating from their colony in nearby Provadiya ). The city was flanked by two fortresses with smaller commercial ports of their own, Kastritsi and Galata, within sight of each other, and was protected by two other strongholds overlooking the lakes, Maglizh and Petrich. Wheat, animal skins, honey and wax, wine, timber and other local agricultural produce for the Italian and Constantinople markets were

5355-451: The 51-member legislature) is the city's legislative body composed of 51 members. As of January 2015 it consists of: centre-right Citizens for European Development of Bulgaria (GERB), 22 council members; centre-right/right-wing Reformist Bloc Patriotic Front (Bulgaria) , 6; centre-left Bulgarian Socialist Party (BSP), 5; "Varna" Coalition including Attack , 4; other smaller parties, groups and independent members, 14. The Council chairman

5474-467: The 681 AD peace treaty with the Byzantine Empire that established the new Bulgarian state was concluded at Varna and the first Bulgarian capital south of the Danube may have been provisionally located in its vicinity—possibly in an ancient city near Lake Varna's north shore named Theodorias (Θεοδωριάς) by Justinian I—before it moved to Pliska 70 kilometres (43 miles) to the west. Asparukh fortified

5593-573: The Black Sea Depression they are terrigenous non-carbonate silts , and at the foot of the continental slope turbidite sediments. The Black Sea is the world's largest body of water with a meromictic basin. The deep waters do not mix with the upper layers of water that receive oxygen from the atmosphere. As a result, over 90% of the deeper Black Sea volume is anoxic water. The Black Sea's circulation patterns are primarily controlled by basin topography and fluvial inputs, which result in

5712-404: The Black Sea are: These rivers and their tributaries comprise a 2-million km (0.77-million sq mi) Black Sea drainage basin that covers wholly or partially 24 countries: Unrecognised states: Some islands in the Black Sea belong to Bulgaria, Romania, Turkey, and Ukraine: Short-term climatic variation in the Black Sea region is significantly influenced by the operation of

5831-585: The Black Sea features a range of trophic groups, with autotrophic algae, including diatoms and dinoflagellates , acting as primary producers. The fluvial systems draining Eurasia and central Europe introduce large volumes of sediment and dissolved nutrients into the Black Sea, but the distribution of these nutrients is controlled by the degree of physiochemical stratification, which is, in turn, dictated by seasonal physiographic development. During winter, strong wind promotes convective overturning and upwelling of nutrients, while high summer temperatures result in

5950-510: The Black Sea from the rest of the global ocean system. The large shelf to the north of the basin is up to 190 km (120 mi) wide and features a shallow apron with gradients between 1:40 and 1:1000. The southern edge around Turkey and the eastern edge around Georgia , however, are typified by a narrow shelf that rarely exceeds 20 km (12 mi) in width and a steep apron that is typically 1:40 gradient with numerous submarine canyons and channel extensions. The Euxine abyssal plain in

6069-472: The Black Sea is called Siyābun . In the tenth-century Persian geography book Hudud al-'Alam , the Black Sea is called Georgian Sea ( daryā-yi Gurz ). The Georgian Chronicles use the name zğua sperisa ზღუა სპერისა (Sea of Speri) after the Kartvelian tribe of Speris or Saspers . Other modern names such as Chyornoye more and Karadeniz (both meaning Black Sea) originated during

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6188-497: The Black Sea was an endorheic basin , operating independently of the global ocean system (similar to the Caspian Sea today). Currently, the Black Sea water level is relatively high; thus, water is being exchanged with the Mediterranean. The Black Sea undersea river is a current of particularly saline water flowing through the Bosporus Strait and along the seabed of the Black Sea, the first of its kind discovered. Current names of

6307-517: The Bosporus Strait from the Mediterranean Sea into the Black Sea, where the water has a lower salt content. Because of the anoxic water at depth, organic matter, including anthropogenic artifacts such as boat hulls, are well preserved. During periods of high surface productivity, short-lived algal blooms form organic rich layers known as sapropels . Scientists have reported an annual phytoplankton bloom that can be seen in many NASA images of

6426-483: The Bosporus is located at 36.5 m (120 ft) below present sea level (deepest spot of the shallowest cross-section in the Bosporus, located in front of Dolmabahçe Palace ) and has a wet section of around 38,000 m (410,000 sq ft). Inflow and outflow current speeds are averaged around 0.3 to 0.4 m/s (1.0 to 1.3 ft/s), but much higher speeds are found locally, inducing significant turbulence and vertical shear. This allows for turbulent mixing of

6545-524: The Getae persuaded him to conclude a treaty) but surrendered to Alexander the Great in 335 BC, and was later ruled by his diadochus Lysimachus , against whom it rebelled in 313 BC as part of a coalition with other Pontic cities and the Getae. Nevertheless, at the end of the 4th c. BC the city became one of the strongholds of Lysimachus. The city became very prosperous from this time due to strong sea trade with many of

6664-433: The Mediterranean states and cities supported by a wide range of local products. Shortly after 108 BC, Odessos recognised the suzerainty of Mithridates VI of Pontus . The Roman city, Odessus , first included into the Praefectura orae maritimae and then in 15 AD annexed to the province of Moesia (later Moesia Inferior ), covered 47 hectares in present-day central Varna and had prominent public baths, Thermae , erected in

6783-448: The N:P:Si ratio in the basin. Coastal areas, accordingly, have seen an increase in the frequency of monospecific phytoplankton blooms, with diatom-bloom frequency increasing by a factor of 2.5 and non-diatom bloom frequency increasing by a factor of 6. The non-diatoms, such as the prymnesiophytes Emiliania huxleyi (coccolithophore), Chromulina sp., and the Euglenophyte Eutreptia lanowii , can out-compete diatom species because of

6902-410: The Pliska-Preslav culture of the First Bulgarian Empire, ostensibly in architecture and plastic decorative arts, but possibly also in literature, including Cyrillic scholarship. In 1201, Kaloyan took over the Varna fortress, then in Byzantine hands, on Holy Saturday using a siege tower , and secured it for the Second Bulgarian Empire . By the late 13th century, with the Treaty of Nymphaeum of 1261,

7021-464: The Rim Current. The Rim Current has a maximum velocity of about 50–100 cm/s (20–39 in/s). Within this feature, two smaller cyclonic gyres operate, occupying the eastern and western sectors of the basin. The Eastern and Western Gyres are well-organized systems in the winter but dissipate into a series of interconnected eddies in the summer and autumn. Mesoscale activity in the peripheral flow becomes more pronounced during these warmer seasons and

7140-434: The Soviet Union boomed in the 1950s to the 1970s. From 20 December 1949 to 20 October 1956 the city was renamed Stalin by the communist government after Soviet dictator Joseph Stalin . In 1962, the 15th Chess Olympiad , also known as the World Team Championship, organized by FIDE , was held in Varna. In 1969 and 1987, Varna was the host of the World Rhythmic Gymnastics Championships. From 30 September to 4 October 1973,

7259-519: The Varna river lowland by a rampart against a possible Byzantine landing; the Asparuhov val (Asparukh's Wall) is still standing. Numerous 7th-century Bulgar settlements have been excavated across the city and further west; the Varna lakes north shores, of all regions, were arguably most densely populated by Bulgars. It has been suggested that Asparukh was aware of the importance of the Roman military camp ( campus tribunalis ) established by Justinian I outside Odessos and considered it (or its remnants) as

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7378-409: The amount of cold air arriving from northern regions during winter. Other influencing factors include the regional topography , as depressions and storm systems arriving from the Mediterranean are funneled through the low land around the Bosporus, with the Pontic and Caucasus mountain ranges acting as waveguides, limiting the speed and paths of cyclones passing through the region. The Black Sea

7497-534: The aristocracy, as well as valuable pateras and ritons . Despite ethnic diversity, numerous internal and external conflicts, and cultural differences, the populations of northeastern Bulgaria and the cities along the seashore have demonstrated stable tolerance to each other. Conservatism is easily noticed in ceramic items and in religion. The highest deity of all was the Thracian horseman , who had different names and functions in different places. Water-related deities were honoured as well, such as The Three Graces or

7616-486: The calcareous Franga Plateau (height 356 m or 1,168 ft) on the north and Avren Plateau on the south, along the horseshoe-shaped Varna Bay of the Black Sea , the elongated Lake Varna , and two artificial waterways connecting the bay and the lake and bridged by the Asparuhov most . It is the centre of a growing conurbation stretching along the seaboard 20 km (12 mi) north and 10 km (6 mi) south (mostly residential and recreational sprawl) and along

7735-424: The cardinal directions , with black or dark for north, red for south, white for west, and green or light blue for east. Hence, "Black Sea" meant "Northern Sea". According to this scheme, the name could only have originated with a people living between the northern (black) and southern (red) seas : this points to the Achaemenids (550–330 BC). In the Greater Bundahishn , a Middle Persian Zoroastrian scripture,

7854-412: The centre of the Black Sea reaches a maximum depth of 2,212 metres (7,257.22 feet) just south of Yalta on the Crimean Peninsula . The Paleo- Euxinian is described by the accumulation of eolian silt deposits (related to the Riss glaciation ) and the lowering of sea levels ( MIS 6, 8 and 10). The Karangat marine transgression occurred during the Eemian Interglacial (MIS 5e). This may have been

7973-462: The chief exports, and Mediterranean foods and luxury items were imported. The city introduced its own monetary standard, the Varna perper , by the mid-14th century; Bulgarian and Venetian currency exchange rate was fixed by a treaty. Fine jewellery, household ceramics, fine leather and food processing, and other crafts flourished; shipbuilding developed in the Kamchiya river mouth. Fourteenth-century Italian portolan charts showed Varna as arguably

8092-607: The city and five suburbs: Kamenar , Kazashko , Konstantinovo , Topoli , and Zvezditsa , served by the city public transport system. The municipal chief executive is the Mayor (кмет, kmet : the word is cognate with count ). Since the end of the de facto one-party communist rule in 1990, there have been four mayors: Voyno Voynov, SDS ( Union of Democratic Forces ), ad interim , 1990–91; Hristo Kirchev, SDS, 1991–99; Kiril Yordanov , independent, 1999–2013; Ivan Portnih , GERB , 2013–2023; Blagomir Kotsev , PP–DB , 2023–present. The City council (общински съвет, obshtinski savet ,

8211-456: The city wall, then at the end of the 4th to early 5th centuries when a pipeline was laid inside the initial masonry aqueduct. Thirdly in the 6th century, an extra pipeline was added parallel to the original west of it and entered the city through a reconstruction of the fortress wall. The city minted coins, both as an autonomous polis and under the Roman Empire from Trajan to Salonina , the wife of Gallienus , some of which survive. Odessos

8330-417: The commonly used designation in Greek, although in mythological contexts the "true" name Póntos Áxeinos remained favoured. Strabo 's Geographica (1.2.10) reports that in antiquity, the Black Sea was often simply called "the Sea" ( ὁ πόντος ho Pontos ). He thought that the sea was called the "Inhospitable Sea Πόντος Ἄξεινος Póntos Áxeinos by the inhabitants of the Pontus region of

8449-411: The day and 0 °C (32 °F) at night. Snow is possible in the coldest months, but can quickly melt. The highest temperature ever recorded was 41.4 °C (106.5 °F) in July 1927 and the lowest −24.3 °C (−11.7 °F) in February 1929. Varna is the administrative centre for Varna county (област, oblast , area). On the other hand, Varna municipality (община, obshtina , borough) comprises

8568-590: The discovery of the Varna Necropolis in 1974, 294 burial sites have been found, with over 3000 golden items inside. Theophanes the Confessor first mentions the name Varna , as the city came to be known, within the context of the Slavic conquest of the Balkans in the 6th to 7th centuries. The name could be of Varangian origin, as Varangians had been crossing the Black Sea for many years, reaching Constantinople in

8687-707: The downfall of his kingdom, Celts blended with the greatly numbered Thracians in the country. Between the 2nd–1st c. BC in present Dobrudja land between Dyonissopolis ( Balchik ) and Odessos were created many small Scythian states. Their "kings" minted their coins in mints located in cities on the west Black Sea coast, including Odessos. The Thracians in northeast Thrace seem to be underdeveloped compared to their counterparts in South Thrace. The people lived in two types of settlements: non-fortified, located in fertile lands near water sources and stone-built fortresses in hard to reach mountain environment, where were usually located

8806-696: The early Middle Ages. In Swedish , värn means 'shield, defense' – hence Varna could mean 'defended, fortified place'. Vikings invaded the settlement during the Middle Ages. The name may be older than that; perhaps it derives from the Proto-Indo-European root *u̯er- 'to flow, wet, water, river' (cf. Varuna ), or from the Proto-Slavic root varn 'black', or from Iranian bar or var 'camp, fortress' (see also Etymological list of provinces of Bulgaria ). According to Theophanes, in 680 Asparukh ,

8925-401: The following countries: Czech Republic, Denmark, Finland, France, Germany, Hungary, Indonesia, Israel, Italy, Norway, South Africa, Spain, Sweden, Ukraine. Varna is twinned with: The first population data date back to the mid-17th century when the town was thought to have about 4,000 inhabitants, while the first population census in 1881 counted 24,555. According to the 1883 census, it

9044-441: The fortification already existed in 469 during the reign of Leo I ( r.  457–474 ) and in 478 in the era of Zeno ( r.  476–491 ), and it was maintained and renewed by Anastasius in the time from 507 to 512. The wall had a thickness of 3.3 m (11 ft) and a height over 5 m (16 ft). It was built complete with towers, gates, forts, ditches and a military way to protect Constantinople from invasions from

9163-536: The founder of the First Bulgarian Empire , routed an army of Constantine IV near the Danube River delta. Pursuing those forces, he reached "the so-called Varna near Odyssos [ sic ] and the midlands thereof" (τὴν λεγομένην Βάρναν, πλησίον Ὀδυσσοῦ). Perhaps the new name applied initially to an adjacent river or lake, a Roman military camp, or an inland area, and only later to the city itself. By

9282-503: The highest sea levels reached in the late Pleistocene . Based on this some scholars have suggested that the Crimean Peninsula was isolated from the mainland by a shallow strait during the Eemian Interglacial. The Neoeuxinian transgression began with an inflow of waters from the Caspian Sea . Neoeuxinian deposits are found in the Black Sea below −20 m (−66 ft) water depth in three layers. The upper layers correspond with

9401-401: The kings' residences. Thracians engaged in farming, wood processing, hunting and fishing. Among their art crafts is metal processing—especially weapons, excelling processing of bronze, making of bracelets, rings, Thracian type of fibulas, horse ornaments, arrowheads. Local goldsmiths used gold and silver to produce typical Thracian plate armour, ceremonial ornaments for the horses of the kings and

9520-499: The lake 25 km (16 mi) west (mostly transportation and industrial facilities). Since antiquity, the city has been surrounded by vineyards, orchards, and forests. Commercial shipping facilities are being relocated inland into the lakes and canals, while the bay remains a recreation area; almost all the waterfront is parkland. The urban area has in excess of 20 km of sand beaches and abounds in thermal mineral water sources (temperature 35–55 °C or 95–131 °F). It enjoys

9639-512: The last major battles of the Crusades in European history was fought outside the city walls. Ottomans routed an army of 20,000–30,000 crusaders led by Ladislaus III of Poland (also Ulászló I of Hungary), which had assembled at the port to set sail to Constantinople. The Christian army was attacked by a superior force of 55,000 or 60,000 Ottomans led by sultan Murad II . Ladislaus III was killed in

9758-546: The late 10th century, the name Varna was established so firmly that when Byzantines wrested back control of the area from the Bulgarians around 975, they kept it rather than restoring the ancient name Odessos . Prehistoric settlements are best known for the Chalcolithic necropolis (mid-5th millennium BC radiocarbon dating), a key archaeological site in world prehistory, eponymous Varna culture and internationally considered

9877-518: The late 1980s. Additionally, an alien species—the warty comb jelly ( Mnemiopsis leidyi )—established itself in the basin, exploding from a few individuals to an estimated biomass of one billion metric tons. The change in species composition in Black Sea waters also has consequences for hydrochemistry, as calcium-producing coccolithophores influence salinity and pH, although these ramifications have yet to be fully quantified. In central Black Sea waters, silicon levels also reduced significantly, due to

9996-515: The late 2nd century AD (so-called Large (North) Ancient Roman Thermae), now the largest Roman remains in Bulgaria (the building was 100 m (328.08 ft) wide, 70 m (229.66 ft) long, and 25 m (82.02 ft) high) and fourth-largest-known Roman baths in Europe which testify to the importance of the city. There is also the Small (South) Ancient Roman Thermae from the 5th–6th century AD. In addition, archaeologists in 2019 discovered ruins of

10115-529: The legitimate seat of power for both Lower Moesia and Scythia. Control changed from Byzantine to Bulgarian hands several times during the Middle Ages . In the late 9th and the first half of the 10th century, Varna was the site of a principal scriptorium of the Preslav Literary School at a monastery endowed by Boris I who may have also used it as his monastic retreat. The scriptorium may have played

10234-407: The limited availability of silicon, a necessary constituent of diatom frustules. As a consequence of these blooms, benthic macrophyte populations were deprived of light, while anoxia caused mass mortality in marine animals. Overfishing during the 1970s further compounded the decline in macrophytes, while the invasive ctenophore Mnemiopsis reduced the biomass of copepods and other zooplankton in

10353-677: The limits of the Black Sea as follows: On the Southwest. The Northeastern limit of the Sea of Marmara [A line joining Cape Rumili with Cape Anatoli (41°13'N)]. In the Kertch Strait . A line joining Cape Takil and Cape Panaghia (45°02'N). The area surrounding the Black Sea is commonly referred to as the Black Sea Region . Its northern part lies within the Chernozem belt (black soil belt) which goes from eastern Croatia ( Slavonia ), along

10472-421: The lowest for the country and sunshine is abundant. The summer begins in early May and lasts till early October. Temperatures in summer usually vary 27–30 °C (81–86 °F) during the day and between 17–18 °C (63–64 °F) at the night. Seawater temperature during the summer months is usually at the range 24–27 °C (75–81 °F). In winter temperatures are about 6–7 °C (43–45 °F) during

10591-465: The mayor's office, and local police, claim that Varna has a population by present address of over 500,000, making it the nation's second-largest city. Official statistics according to GRAO and NSI, however, have not supported their claims. In 2008, Deputy Mayor Venelin Zhechev estimated the actual population at 650,000. In December 2008, Mayor Kiril Yordanov claimed the actual number of permanent residents

10710-433: The military. However, it is noted that in Varna, the so-called mutri (Mafia) presence was by no means as visible as it was in smaller coastal towns and resorts. Over the last couple of years, crime has subsided, which is said to have contributed to Varna being named as Bulgaria's Best City to Live In (2007); in 2007, the regional police chief was promoted to the helm of the national police service. There are consulates of

10829-606: The most important seaport between Constantinople and the Danube delta; they usually labelled the region Zagora . The city was unsuccessfully besieged by Amadeus VI of Savoy, who had captured all Bulgarian fortresses to the south of it, including Galata, in 1366. In 1386, Varna briefly became the capital of the spinoff Principality of Karvuna , then was taken over by the Ottomans in 1389 (and again in 1444), ceded temporarily to Manuel II Palaeologus in 1413 (perhaps until 1444), and sacked by Tatars in 1414. On 10 November 1444, one of

10948-442: The north arm of the bay, yet January and February still can be bitterly cold at times, with blizzards. Black Sea water has become cleaner after 1989 due to decreased chemical fertiliser in farming; it has low salinity, lacks large predators or poisonous species, and the tidal range is virtually imperceptible. The city lies 470 km (292 mi) north-east of Sofia; the nearest major cities are Dobrich (45 km or 28 mi to

11067-401: The north), Shumen (80 km or 50 mi to the west), and Burgas (125 km or 78 mi to the south-west). Varna has a humid subtropical climate ( Köppen climate classification Cfa ). The specific Black sea climate is milder than the inland parts of the country and the sea influence lowers the effect of the occasional cold air masses from the north-east. Average precipitation is

11186-402: The offensive-defensive alliance between Michael VIII Palaeologus and Genoa that opened up the Black Sea to Genoese commerce, Varna had turned into a thriving commercial port city frequented by Genoese and later also by Venetian and Ragusan merchant ships. The first two maritime republics held consulates and had expatriate colonies there (Ragusan merchants remained active at the port through

11305-763: The others being the Red Sea , the White Sea and the Yellow Sea . The earliest known name of the Black Sea is the Sea of Zalpa, so called by both the Hattians and their conquerors, the Hittites . The Hattic city of Zalpa was "situated probably at or near the estuary of the Marrassantiya River, the modern Kızıl Irmak , on the Black Sea coast." The principal Greek name Póntos Áxeinos

11424-454: The outflow of fresher Black Sea surface-water into the Sea of Marmara occurs near the surface. According to Gregg (2002), the outflow is 16,000 cubic metres per second (570,000 cubic feet per second) or around 500 cubic kilometres per year (120 cubic miles per year), and the inflow is 11,000 m /s (390,000 cu ft/s) or around 350 km /a (84 cu mi/a). The following water budget can be estimated: The southern sill of

11543-501: The peak of the Khvalinian transgression, on the shelf shallow-water sands and coquina mixed with silty sands and brackish-water fauna, and inside the Black Sea Depression hydrotroilite silts. The middle layers on the shelf are sands with brackish-water mollusc shells. Of continental origin, the lower level on the shelf is mostly alluvial sands with pebbles, mixed with less common lacustrine silts and freshwater mollusc shells . Inside

11662-488: The photic zone, enhancing productivity. In total, the Black Sea's biodiversity contains around one-third of the Mediterranean's and is experiencing natural and artificial invasions or "Mediterranizations". The main phytoplankton groups present in the Black Sea are dinoflagellates , diatoms , coccolithophores and cyanobacteria . Generally, the annual cycle of phytoplankton development comprises significant diatom and dinoflagellate-dominated spring production, followed by

11781-467: The population of northeast Thrace was very diverse, including the region around Odessos. During 6th–4th c. BC the region was populated with Scythians who normally inhabited the central Eurasian Steppe (South Russia and Ukraine) and partly the area south of river Istros (the Thracian name of lower Danube ). Characteristic for their culture weapons and bronze objects are found all over the region. Scythian horse ornaments are produced in "animal style", which

11900-662: The preservation of ancient shipwrecks which have been found in the Black Sea, which ultimately drains into the Mediterranean Sea , via the Turkish Straits and the Aegean Sea. The Bosporus strait connects it to the small Sea of Marmara which in turn is connected to the Aegean Sea via the strait of the Dardanelles . To the north, the Black Sea is connected to the Sea of Azov by the Kerch Strait . The water level has varied significantly over geological time. Due to these variations in

12019-488: The region. As a result of these characteristics the Black Sea has gained interest from the field of marine archaeology , as ancient shipwrecks in excellent states of preservation have been discovered, such as the Byzantine wreck Sinop D , located in the anoxic layer off the coast of Sinop, Turkey . Modelling shows that, in the event of an asteroid impact on the Black Sea, the release of hydrogen sulfide clouds would pose

12138-464: The sea are usually equivalents of the English name "Black Sea", including these given in the countries bordering the sea: Such names have not yet been shown conclusively to predate the 13th century. In Greece , the historical name "Euxine Sea", which holds a different literal meaning (see below), is still widely used: The Black Sea is one of four seas named in English after common color terms –

12257-625: The sea. The collision between the Eurasian and African plates and the westward escape of the Anatolian block along the North Anatolian and East Anatolian faults dictates the current tectonic regime, which features enhanced subsidence in the Black Sea basin and significant volcanic activity in the Anatolian region. These geological mechanisms, in the long term, have caused the periodic isolations of

12376-548: The seaside resorts north of the city centre), and Vladislav Varchenchik. The boroughs are composed of various districts with distinctive characters and histories. The villages too have а mayor or a mayoral lieutenant (кметски наместник, kmetski namestnik ). Varna was rumoured to be the hub of Bulgarian organised crime . Some sectors of the economy, including gambling, corporate security, tourism, real estate, and professional sports, were believed to be controlled in part by business groups with links to Communist-era secret services or

12495-492: The southern shoreline before Greek colonisation due to its difficult navigation and hostile barbarian natives (7.3.6), and that the name was changed to "hospitable" after the Milesians colonised the region, bringing it into the Greek world. Popular supposition derives "Black Sea" from the dark color of the water or climatic conditions. Some scholars understand the name to be derived from a system of colour symbolism representing

12614-556: The time of Astyages (here, usually 572–570 BC is suggested), within an earlier Thracian settlement. The name Odessos could have been pre-Greek, arguably of Carian origin. It was the presiding member of the Pontic Pentapolis , consisting of Odessos, Tomi , Callatis , Mesembria , and Apollonia . Odessos was a mixed community—contact zone between the Ionian Greeks and the Thracian tribes ( Getae , Krobyzoi , Terizi ) of

12733-651: The timings of these events remain uncertain. Arc volcanism and extension occurred as the Neo-Tethys Ocean subducted under the southern margin of Laurasia during the Mesozoic . Uplift and compressional deformation took place as the Neotethys continued to close. Seismic surveys indicate that rifting began in the Western Black Sea in the Barremian and Aptian followed by the formation of oceanic crust 20 million years later in

12852-408: The two layers. Surface water leaves the Black Sea with a salinity of 17 practical salinity units (PSU) and reaches the Mediterranean with a salinity of 34 PSU. Likewise, an inflow of the Mediterranean with salinity 38.5 PSU experiences a decrease to about 34 PSU. Mean surface circulation is cyclonic ; waters around the perimeter of the Black Sea circulate in a basin-wide shelfbreak gyre known as

12971-506: The villages of Dobrina, Kipra, Brestak and other, all in Varna Province . The Thracians in the region were ruled by kings, who entered into unions with the Odrysian kingdom , Getae or Sapaeans —large Thracian states existing between 5th–1st c. BC. Between 336–280 BC these Thracian states along with Odessos were conquered by Alexander the Great . Archaeological findings have indicated that

13090-679: The wall are visible in Gümüşpınar junction in Karacaköy, Hisartepe in Yalıköy, Pınarca in İhsaniye and Kurfallı village. The wall was part of an additional outer defense system for Constantinople , capital of the Eastern Roman Empire and probably continued in use until the 7th century. The wall was named after the Emperor Anastasius I ( r.  491–518 ). However, there is evidence that

13209-524: The water Nymphs and Zalmoxis by the Getae . During the centuries, especially by the end of the Hellenistic period (2nd–1st c. BC), Thracians adopted the more elaborated Hellenistic culture, thus acting as an intermediate for the continental Thracians. Odessos or Odessus ( Ancient Greek : Ὀδησσός ) is one of the oldest ancient settlements in Bulgaria. Its name appears as Odesopolis (Ὀδησόπολις) in

13328-452: The water level in the basin, the surrounding shelf and associated aprons have sometimes been dry land. At certain critical water levels, connections with surrounding water bodies can become established. It is through the most active of these connective routes, the Turkish Straits, that the Black Sea joins the World Ocean . During geological periods when this hydrological link was not present,

13447-407: The west by Huns , Slavs and Bulgars . A rectangular castrum with dimensions of 250 m (820 ft) by 300 m (980 ft) existed also in the central section of the wall. It is known that the wall had only a limited effectiveness, and various groups attacking Constantinople penetrated it many times, because the fortification's length made it difficult to defend the wall completely by

13566-643: The world's oldest large find of gold artefacts, existed within modern city limits. In the wider region of the Varna lakes (before the 1900s, freshwater) and the adjacent karst springs and caves, over 30 prehistoric settlements have been unearthed with the earliest artefacts dating back to the Middle Paleolithic or 100,000 years ago. Since late Bronze Age (13th–12th c. BC) the area around Odessos had been populated with Thracians . During 8th–9th c. BC local Thracians had active commercial and cultural contacts with people from Anatolia , Thessaly , Caucasus and

13685-557: Was 970,000, or that there were 60% unregistered people. In January 2009, the Financial Times said that "Varna now draws about 30,000 new residents a year." The census, carried out in February 2011, enumerated 334,870 inhabitants. If unregistered population plus the commuters from the adjacent municipalities are taken into consideration, the real population of the city during a work day reaches 400,000. Varna attracts 2 to 3 million tourists

13804-547: Was an early Christian centre, as testified by ruins of twelve early basilicas, a monophysite monastery, and indications that one of the Seventy Disciples , Ampliatus , follower of Saint Andrew (who, according to the Bulgarian Orthodox Church legend, preached in the city in 56 CE), served as bishop there. In 6th-century imperial documents, it was referred to as "holiest city," sacratissima civitas . In 442

13923-563: Was badly affected by the temporary loss of its agrarian hinterland of Southern Dobruja to Romania (1913–16 and 1919–40). In the Second World War , the Red Army occupied the city in September 1944 and helped to cement communist rule in Bulgaria. One of the early centres of industrial development and the Bulgarian labour movement, Varna established itself as the nation's principal port of export,

14042-464: Was recorded in Varna. As a result, local notables that participated in the Greek national movement were executed by the Ottoman authorities, while others managed to escape to Greece and continue their struggle. The British and French campaigning against Russia in the Crimean War (1854–1856) used Varna as headquarters and principal naval base; many soldiers died of cholera and the city was devastated by

14161-750: Was the second-largest in Bulgaria after Ruse . Thereafter Varna became Bulgaria's third-largest city and kept this position steadily for the next 120 years, while different cities took turns in the first, second, and fourth places. In January 2012, the city of Varna has a population of 334,781, which makes it the third-largest city in Bulgaria, while the Varna Municipality along with the legally affiliated adjacent villages had 343,643 inhabitants. The unofficial metro area (including Varna municipality and adjacent parts of Aksakovo, Avren, Beloslav, and Devnya municipalities, and excluding adjacent parts of Dobrich Province ) has an estimated population of 475,000. Here,

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