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72-582: Odesa Portside Plant is a chemical-industrial enterprise in Odesa Oblast , Ukraine . The chemical plant is located on the shores of the Small Adzhalyk Estuary and is situated next to Pivdennyi Port through which chemical cargo is transshipped. The key stake belongs to Group DF . In May 2022, the plant was shelled by Russians missiles. Odesa Oblast The length of coastline (sea-coast and estuaries) reaches 300 km (190 mi), while

144-514: 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

216-582: 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,

288-536: 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

360-561: A relative majority in the southern port city of Izmail . Significant Bulgarian (6.1%) and Moldovan (5.0%) minorities reside in the province, who mostly live in the southeastern part of the region. It has the highest proportion of Jews of any oblast in Ukraine (although smaller than the Autonomous City of Kyiv ) and there is a small Greek community in the city of Odesa. Bulgarians and Moldovans represent 21% and 13% respectively, of

432-433: A reputation for fertility, and intensive agriculture is the mainstay of the local rural economy. The southwest has many orchards and vineyards, while arable crops grow throughout the region. Significant branches of the oblast's economy are: The region's industrial capability is principally concentrated in and around Odesa. The oblast's population (as at the start of 2021) was 2,368,107 people, nearly 43% of whom lived in

504-671: A sociological survey conducted by the Ilko Kucheriv Democratic Initiatives Foundation from 10 to 21 July 2023 in Odesa Oblast, the share of respondents who speak Ukrainian at home has increased to 42% (from 26% in 2021), while the share of those who speak Russian at home has dropped to 54%. To the question "How do you feel about the mandatory use of Ukrainian in the service sector (shops, cafes, barber shops, entertainment venues)?" 59% answered "Positive", 13% — "Negative", 17% — "I don't care", 12% — "Hard to say". To

576-569: 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

648-433: 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,

720-516: 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

792-492: 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

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864-604: Is Sergei Utochkin who was a universal sportsman excelling in cycling, boxing, swimming and played football for the Odesa British Athletic Club . Utochkin had challenged a steam-powered tram while running, on a bicycle he beat a galloping horse, while on roller skates he was passing a bicyclist. The next stage for him was to conquest skies. Utochkin managed to buy an airplane from a local banker and completed dozens of exhibition flights. Eventually, he managed to assemble his own Farman -type airplane. In Kyiv, Utochkin

936-608: 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

1008-718: 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

1080-702: 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

1152-580: 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

1224-454: 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

1296-570: 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

1368-713: 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

1440-834: 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

1512-793: The Declaration of Independence of Ukraine . A survey conducted in December 2014 by the Kyiv International Institute of Sociology found that 2.3% of the oblast's population supported their region joining Russia, 91.5% did not support the idea, and the rest were undecided or did not respond. A poll reported by Alexei Navalny and conducted in September 2014 found similar results. On 4-5 July 2022 during international Ukraine Recovery Conference (URC 2022) in Lugano Switzerland pledged to support

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1584-801: The Khanate of Ukraine . The northern outskirts of the current oblast, forming part of Podolia , remained within Lithuania, and then passed to the Kingdom of Poland in 1569, within which they were located in Bracław County in the Bracław Voivodeship in the Lesser Poland Province . Savran , Kodyma and Józefgród were Polish private towns , the two latter founded by the Lubomirski family . The bulk of

1656-730: 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

1728-614: 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

1800-505: 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

1872-519: The tumuli and hoards of the Bronze Age Proto-Indo-Europeans . In the 1st millennium B.C. Milesian Greeks founded colonies along the northern coast of the Black Sea, including the towns of Tyras and Niconium in the modern Odesa Oblast. The Greeks left behind painted vessels, ceramics, sculptures, inscriptions, arts and crafts that indicate the prosperity of their ancient civilisation. The culture of Scythian tribes inhabiting

1944-632: 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

2016-573: 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

2088-404: 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

2160-585: 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

2232-510: 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

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2304-472: 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

2376-494: The Black Sea littoral in the 13th century. From about 1290 parts of the region were territories of the Republic of Genoa , becoming a center of Genoese commercial activity until at least the middle of the 14th century . The Grand Duchy of Lithuania acquired the area at the beginning of the 15th century. In 1593 the Ottoman Empire set up in the area what became known as its Dnieper Province ( Özü Eyalet ), unofficially known as

2448-503: The Black Sea littoral steppes in the first millennium B.C. has left artefacts in settlements and burial grounds, including weapons, bronze cauldrons, other utensils, and adornments. By the beginning of the 1st millennium A.D. the Sarmatians displaced the Scythians . In the 3rd–4th centuries A.D. a tribal alliance, represented by the items of Chernyakhov culture , developed. From the middle of

2520-497: 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

2592-517: 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

2664-483: 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

2736-562: 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

2808-464: 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

2880-464: 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

2952-824: The area became part of the Ukrainian People's Republic (1917–1918), but soon succumbed first to the Russian Volunteer Army (part of the White movement ) and then to the Russian Bolshevik Red Army . By 1920 the Soviet authorities had secured the territory of Odesa Oblast, which became part of the Ukrainian SSR . The oblast was established on 27 February 1932 from five districts: Odesa Okruha, Pervomaisk Okruha, Kirovohrad Okruha, Mykolaiv Okruha, and Kherson Okruha. It

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3024-537: 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,

3096-519: 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

3168-526: The city of Odesa. According to the Ukrainian national census in 2001 , ethnic Ukrainians are by far the largest ethnic group, accounting for 62,8% of the population. They are the dominant ethnic group in the northern, central and southeastern part of the province, as well as in the regional capital of Odesa . Making up 20.7% of the population, Russians are the second-largest group in the region and are mostly concentrated in urban areas, yet they only constitute

3240-511: 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

3312-549: The first millennium the formation of the Slavic people began. In the 9th century the eastern Slavs united into a state with Kyiv as its centre. The Khazars , Polovtsy and Pechenegs were the Slavs' neighbours during different times. Archeological evidence of the period of the 9th–14th centuries survives in materials from the settlements and cities of Kievan Rus' : Belgorod, Caffa- Theodosia , and Berezan Island . The Mongols took over

3384-503: 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

3456-518: 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

3528-407: 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

3600-677: 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

3672-402: The oblast government – ( Bilhorod-Dnistrovskyi , Chornomorsk , Izmail , Pivdenne , Podilsk , Teplodar and the administrative centre of the oblast, Odesa ). On 18 July 2020, the number of districts ( raions ) was reduced to seven, now also incorporating the formerly independent cities. (see map). They are now divided into 91 municipalities ( hromadas ). One of the most famous Odesits

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3744-403: 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

3816-454: 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

3888-448: 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

3960-488: 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

4032-685: The population in the salient of Budjak , within Odesa Oblast. Native language in Odesa Oblast (2022) According to the 2001 Ukrainian census , Ukrainian was the mother tongue of 46.3% of the population, 42.0% for Russian , 4.9% for Bulgarian , and 3.8% Romanian . According to a sociological survey conducted by the Ilko Kucheriv Democratic Initiatives Foundation  [ uk ] from 21 to 27 October 2022, 57.8% of respondents in Odesa Oblast named Ukrainian as their native language, 28.8% — Russian, 5.4% — another language, 7.9% said they found it difficult to say which language they considered their native language or refused to answer. According to

4104-413: The population. Another 8% declares to be non-religious and 6% are unaffiliated generic Christians . Adherents of Catholicism and Protestantism make up 0.5% of the population respectively. The Orthodox community of Odesa Oblast is divided as follows: Until 2020, the Odesa Oblast was administratively subdivided into 26 raions ( districts ) and 7 municipalities which were directly subordinate to

4176-497: 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

4248-454: The question "Do you think it is acceptable to perform songs in Russian in the public space of your village/city, for example, performances by street musicians, listening to such songs in cafes/restaurants or supermarkets, etc.?" 30% answered "No", 37% — "Yes", 20% — "I don't care", 12% — "I find it difficult to answer". Religion in Odesa Oblast (2015) The dominant religion in Odesa Oblast is Eastern Orthodox Christianity , professed by 84% of

4320-461: The rebuilding of Odesa region. Ukraine's largest oblast by area, the Odesa Oblast occupies an area of around 33,314 square kilometres (12,863 sq mi). It is characterised by largely flat steppes – part of the Black Sea Lowland – divided by the estuary of the Dniester river, and bordered to the south by the Danube . Its Black Sea coast has numerous sandy beaches, estuaries and lagoons. The region's soils (especially chernozems ) have

4392-437: 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

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4464-414: 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 –

4536-415: 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

4608-441: 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

4680-463: The state border stretches for 1,200 km (750 mi). The region has eight seaports and five of the biggest lakes, including Yalpuh Lake , in Ukraine. With over 80,000 ha (200,000 acres) of vineyards, it is also the largest wine-growing region in Ukraine . Evidence of the earliest inhabitants in this area comes from the settlements and burial grounds of the Neolithic Gumelnița , Cucuteni-Trypillia and Usatove cultures, as well as from

4752-406: The territory of the Odesa Oblast passed to Russian control in 1791 in the course of the Russian southern expansion towards the Black Sea at the end of the 18th century, whereas the northern outskirts were annexed by Russia in the Second Partition of Poland in 1793. Russian historiography refers to the annexed area from 1791 as the Ochakov Oblast. After the February Revolution of 1917 in Russia

4824-439: 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

4896-408: 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

4968-456: The war the Soviet administration reestablished the oblast with its pre-war borders. Odesa Oblast expanded in 1954 to absorb Izmail Oblast (also known as the Budjak region of Bessarabia ), formed in 1940 as a result of the Soviet occupation of Bessarabia and Northern Bukovina (from Romania ), when Northern and Southern parts of Bessarabia were given to the Ukrainian SSR. During the 1991 referendum , 85.38% of votes in Odesa Oblast favored

5040-399: 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,

5112-475: Was demonstrating his piloting skills in front of some 50,000 people, among which was a future creator of helicopters Igor Sikorsky . A number of other notable people were born in Odesa, including the poet Anna Akhmatova , former NASA scientist Nicholas E. Golovin who worked with the Apollo program , composer Tamara Maliukova Sidorenko , and the founder of jazz in the Soviet Union Leonid Utyosov . Black Sea Unrecognised states: The Black Sea

5184-773: Was the scene of Soviet genocidal crimes, including the Holodomor of 1932–1933 and Polish Operation of the NKVD of 1937. In 1937 the Central Executive Committee of the USSR split off the eastern portions of the Odesa Oblast to form the Mykolaiv Oblast . During World War II Axis forces conquered the area and Romania occupied the oblast and administered it as part of the Transnistria Governorate (1941–1944). After

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