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94-687: In much of the central and eastern sections, the summit forms the watershed between the drainage basins of the Black Sea and the Aegean . A prominent gap in the mountains is formed by the predominantly narrow Iskar Gorge , a few miles north of the Bulgarian capital, Sofia . The karst relief determines the large number of caves, including Magura , featuring the most important and extended European post-Palaeolithic cave painting, Ledenika , Saeva dupka , Bacho Kiro , etc. The most notable rock formation are

188-527: 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

282-491: 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. Sub-Balkan valleys The Sub-Balkan Valleys ( Bulgarian : Подбалкански котловини , romanized :  Podbalkanski kotlovini ) are row of 11 valleys running from the Bulgarian border with Serbia east to

376-793: 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 – 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

470-638: A locally endemic winged bellflower ( Campanula calyciliata ) and Pančić's frog grass ( Senecio pancicii ), which can be found only on the mountain. There are also communities of mountainous sphagnum bogs on the localities of Jabučko Ravnište, Babin Zub and Arbinje. Some 350 herb species are considered medicinal or aromatic . In 2022, several independent surveys from various universities and institutes were conducted, in order to list all of them, to enhance their protection, and to check possibilities for potential plantation production. Vast areas south and southeast from

564-484: 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

658-452: A much smaller scale. The 500 metres (1,600 ft) long gorge is a remnant of the former cave which eroded in time. Underground waters on the mountain reach the surface in the forms of common springs, well-springs ( vrelo ) and diffused springs ( pištevina ). There are some 500 springs with the flow of over 0.1 L/s (1.3 imp gal/min). The strongest spring is the intermittent Jelovičko vrelo , known for its fluctuations, characterized by

752-783: A rather young and recently formed part of the Alp-Himalayan chain which stretches across most of Eurasia . The Balkan Mountains can be divided into two parts—the main Balkan Chain and the Pre-Balkans (Fore-Balkan) to the north, which extend slightly onto the Danubian Plain . To the south, the mountains border the Sub-Balkan valleys , a row of 11 valleys running from the Bulgarian-Serbian border east to

846-589: 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

940-433: 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,

1034-529: 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

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1128-496: 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

1222-466: A young brown bear was filmed on camera. There are 203 species of birds, of which 154 are nesting in the park, 10 are wintering, 30 are passing and 13 are wandering. Important species include golden eagle , Ural owl and hawk . As the park is the most important habitat in Serbia for long-legged buzzard , Eurasian woodcock and an endemic Balkan horned lark , an area of 440 km (170 sq mi)

1316-612: Is a salmonid region, inhabited by the riverine brown trout . Another 25 species of fish live in the rivers and streams, so as the fire salamander and newts . Over 30 mammalian species are found in the park, including lesser mole-rat , hazel dormouse and the Tertiary relict, European snow vole . Brown bear became extinct in Serbian part, but evidence showing the presence of the bears were found in 2014. The bears have been photographed in 2015, before disappearing again until 2019 when

1410-442: 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 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

1504-518: Is about 1,175 km (730 mi). Important cities along the coast include (clockwise from 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

1598-568: Is also its southernmost locality worldwide. There have been successful efforts in the reintroduction of two vulture species that went extinct from the mountain range in the past several decades. In 2021 the first cinereous vulture in Bulgaria in nearly 30 years hatched in Kotel mountains in the eastern section of the mountain range, thus establishing the second breeding colony in the Balkans, after

1692-470: 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 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,

1786-490: Is key for the protection of the eastern imperial eagle , saker falcon , Eurasian eagle-owl , Eurasian pygmy owl , Ural owl , boreal owl , white-backed woodpecker , semicollared flycatcher and the corn crake . The park's herpetofauna includes 15 reptile and nine amphibian species. It hosts vital populations of common European adder ( Vipera berus ), European toad , grass snake ( Natrix natrix ), legless lizard , tessellated water snake , viviparous lizard and

1880-757: Is only found within the park's boundaries, Аlchemilla аchtarowii , Alchemilla jumrukczalica , Betonica bulgarica , Centaurea davidovii , as well as another 75 Balkan endemics. The vertebrate fauna of Central Balkan National Park consists of over 300 species. The number of mammal species is around 60, including animals of high conservation concern, such as the: Balkan chamois ( R. rupicapra balcanica ), Eurasian brown bear , Eurasian otter , Eurasian wolf , European ground squirrel , European snow vole , European wild boar , European wildcat , Lesser mole-rat , Marbled polecat , Pine marten , Red deer , Red fox , Western roe deer . The avifauna includes some 220 species, of which 123 are resident/nesting. The park

1974-590: 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

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2068-460: 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

2162-534: Is therefore anoxic . This anoxic layer is responsible for 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

2256-477: 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 the amount of cold air arriving from northern regions during winter. Other influencing factors include

2350-753: The Aegean Sea in the south. However, they are crossed by Bulgaria's longest river, the Iskar , which forms the Iskar Gorge . Rivers that take their source from the Balkan Mountains and flow northwards to the Danube include the Timok , Archar , Lom , Tsibritsa , Ogosta , Skat , Vit , Osam , Yantra , and Rusenski Lom . The mountains are also the source of the Kamchiya , which flows directly into

2444-563: The Aegean Sea . While the net flow of water through the Bosporus and Dardanelles (known collectively as 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

2538-588: The Belogradchik Rocks in the west. There are several important protected areas: Central Balkan National Park , Vrachanski Balkan , Bulgarka and Sinite Kamani , as well as a number of nature reserves . The Balkan Mountains are remarkable for their flora and fauna. Edelweiss grows there in the region of Kozyata stena . Some of the most striking landscapes are included in the Central Balkan National Park with steep cliffs,

2632-474: The Black Sea , separating the Balkan Mountains from a chain of other ranges known as Srednogorie (which includes Vitosha and Sredna Gora ). The Balkan Mountains consist of around 30 distinct peaks; within Bulgaria, the range can be divided into three sections: In their central and eastern sections, the mountains form a water divide between the rivers flowing to the Danube in the north and those flowing to

2726-638: The Black Sea . They are separating the Balkan Mountains from a chain of other mountains known as Srednogorie which includes Vitosha and Sredna Gora . There is great abundance of mineral waters. They are divided into two parts: Western (higher) and Eastern (lower). The western valleys include: Burel Valley ; Sofia Valley ; Saranska Valley ; Kamarska Valley . The eastern valleys are: Zlatitsa–Pirdop Valley ; Karlovo Valley ; Kazanlak Valley ; Tvarditsa Valley ; Sliven Valley ; Karnobat Valley ; Aytos Valley . This Bulgaria location article

2820-536: The Danube , Dnieper and Dniester . Consequently, while six countries have 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

2914-595: The Kartvelian tribe of Speris or Saspers . Other modern names such as Chyornoye more and Karadeniz (both meaning Black Sea) originated during 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

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3008-656: 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 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

3102-565: The Ottoman rule , many haiduks found refuge in the Balkan Mountains. Close to the highest summit, Botev Peak , is Kalofer , the birthplace of Hristo Botev , a Bulgarian poet and national hero who died in the western Balkan Mountains near Vratsa in 1876 in the struggle against the Ottoman Empire . Also close to Botev is Shipka Pass , the scene of the four battles in the Russo-Turkish War, 1877-78 , which ended Turkish rule in

3196-641: The Paleozoic to the Cenozoic eras. Limestone terrain is known for the short losing streams and tufaceous waterfalls. There are canyons and gorges, like those of the Toplodolska reka and Rosomačka reka rivers. The Rosomača canyon ( Rosomački lonci or Slavinjsko grlo ), with its 60 metres (200 ft) tall, cascade limestone walls, is known for its resemblance of the Colorado's Grand Canyon, but on

3290-727: The Pontic Mountains to the south, bar the southwest-facing peninsulas, 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

3384-494: The Roman period and late mediaeval monastic complexes. Some of those older monuments are fragmentary and relocated from their original locations. There are numerous examples of the ethnic edifices characteristic for the architecture of the region in the late 19th and early 20th century (houses, barns, etc.) Serbian section of the mountain is seen as a location for dozens of micro hydros , mini power plants which caused problem with

3478-440: The common frog . Due to the park's high altitude, the ichthyofauna consists of six fish species, with brown trout being the dominant one. Vrachanski Balkan Nature Park is situated in the western section of the mountain range and spans an area of 301.29 km. Its territory includes some of the most extensive karst areas in Bulgaria with over 600 caves, such as Ledenika , the gorge Vratsata whose 400 m vertical cliffs are

3572-414: The golden eagle , long-legged buzzard , peregrine falcon , Eurasian eagle-owl, Alpine chough , Alpine swift , Eurasian crag martin , red-rumped swallow , wallcreeper , etc. There are 15 reptile and 11 amphibian species; of them important populations exist of the meadow lizard , European copper skink , Balkan crested newt , as well as the only habitat in Bulgaria of the northern crested newt , which

3666-426: The 1940s, in a number of localities along the Balkan Mountains. First group of trees was protected in 1966, followed by the creation of 7 special nature reserves and 3 natural monuments in the 1980s. Nature park Stara Planina was established in 1997 and since 2009 is in its present borders, covering an area of 1,143.22 km (441.40 sq mi). The protected area was expanded in 2020. The sediments extend from

3760-483: The Balkan Mountains at the following passes (listed from west to east): The Balkan Mountains have had a significant and special place in the history of Bulgaria since its founding in 681. It was a natural fortress of the Bulgarian Empire for centuries and formed an effective barrier to Moesia where most of the medieval capitals were located. The Balkan mountains were the site of numerous battles between

3854-604: The Balkans), as well as Borov Kamak , Babsko Praskalo , Etropole Waterfall , Karlovsko Praskalo , and Skaklya, among others. The area of the Stara Planina has always been sparsely populated and inaccessible because of the rugged and forested terrain, but also as a location of the Serbian-Bulgarian border. As armies relinquished the borders, giving control to the border police, civilians were allowed to explore

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3948-465: The Balkans. Significant areas of the Balkan mountains are under protection by Bulgarian law, including one national park — Central Balkan National Park ; three nature parks — Vrachanski Balkan Nature Park , Bulgarka Nature Park and Sinite Kamani Nature Park, over 20 nature reserves, as well as numerous natural landmarks. Central Balkan National Park is among the largest and most valuable of

4042-546: The Biosphere Programme and for the world list of geoparks , while over tens of thousands of citizens signed petitions against the micro hydros and numerous protests have been organized by the local population. This prompted similar protests in other parts of Serbia and the association "Defend the rivers of Stara Planina" was founded, which expanded its base of operations outside of the Stara Planina region. The activism resulted in various physical altercation between

4136-582: 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

4230-544: 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 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

4324-585: 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

4418-632: 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 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

4512-772: 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 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

4606-442: The Black Sea. Although not so abundant in mineral waters as other parts of Bulgaria, there are several spas such as Varshets , Shipkovo and Voneshta Voda. Developments in modern times have completely changed the geography of Serbia, especially when it comes to waterfalls. Still, there are a number of waterfalls to be seen, especially in the western and central parts of the range, such as Raysko Praskalo (the highest waterfall in

4700-525: 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

4794-483: 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

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4888-677: The Bulgarian and Byzantine Empires including the Battle of the Rishki Pass (759), Battle of the Varbitsa Pass (811), the Battle of Tryavna (1190) and the Battle of Devina (1279). In the battle of the Varbitsa Pass, Khan Krum decisively defeated an enormous Byzantine army, killing Emperor Nikephoros I . For many centuries, the Byzantines feared these mountains, their armies reportedly retreating upon approaching them. During

4982-674: 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 the timings of these events remain uncertain. Arc volcanism and extension occurred as

5076-576: 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

5170-813: 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 the Santonian . Since its initiation, compressional tectonic environments led to subsidence in

5264-464: 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

5358-406: The Turkish Straits, that the Black Sea joins the World Ocean . During geological periods when this hydrological link was not present, 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

5452-424: The area. As a result, higher and higher waterfalls have been discovered on the Serbian side of the Stara Planina in the years since, including Čungulj (1996) at 43 m (141 ft); Pilj (2002) at 64 m (210 ft); Kopren (2011) at 103.5 m (340 ft); and Kaluđerski Skokovi (2012) at 232 m (761 ft). The mountains are crossed by 20 passes and two gorges. There are paved roads crossing

5546-425: 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 the sea. The collision between the Eurasian and African plates and

5640-652: The bubbling and foaming. Montane ecosystems are diverse and include several plant communities: forests, shrubs, meadows, pastures and peatlands . There are six different vegetation zone in the park. Oak , beech , spruce , subalpine zone of the shrub vegetation of common horsetail , blueberry , subalpine spruce and mugo pine . Other plants include shrub alder , steppe pedunculate oak , but also rare and endangered species like European pasqueflower , yellow pheasant's eye , Kosovo peony , common sundew , Heldreich's maple , martagon lily , pygmy iris and marsh orchid . In total, there are 1,190 plant species, including

5734-412: 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

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5828-422: The cinereous vultures were seen flying over the Serbian side, while the population decline of Egyptian vultures was slowed down. Neither griffon nor cinereous vultures are still nesting on Serbian side. The latter has not been nesting since the 1960s, when they were eradicated through the state operated campaign of poisoning wolves. Human heritage spans from the prehistoric remains, Classical antiquity including

5922-401: The dark color of the water or climatic conditions. Some scholars understand the name to be derived from a system of colour symbolism representing 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

6016-403: The environmentalists and local population. Even the Ministry for environmental protection halted some of the projects and litigated with the investors. They also announced the change of the Nature protection law, which will permanently forbid the construction of plants in protected areas. In order to prevent further degradation, the Nature Park Stara Planina was nominated for the UNESCO 's Man and

6110-480: The estuary of the Marrassantiya River, the modern Kızıl Irmak , on the Black Sea coast." The principal Greek name Póntos Áxeinos 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 ),

6204-413: The future, too. By the 2020s, Stara Planina became a popular filmmaking locality. With Serbian productions, the foreign movies were also filmed here, including the 2019 Indian action movie Uri: The Surgical Strike . Its director, Aditya Dhar , expressed surprise with "unremarkable similarity between Stara Planina and Kashmir ". The 2022 Australian Oscar entry You Won't Be Alone was also filmed on

6298-569: The highest waterfall in the Balkans Raysko Praskalo (124.5 m). The rugged and diverse relief determines the presence of numerous gorges , cliffs , water features and caves, including Raychova Dupka, the second-deepest cave discovered in Bulgaria and in the mountain range, reaching depth of -377 m. The flora of Central Balkan National Park is diverse and consists of 1689 species of vascular plants , 45 species of algae and 238 species of mosses . These include 23 Bulgarian endemic species, such as leafy primrose ( Primula frondosa ), which

6392-658: The highest in the Balkans, and numerous waterfalls, such as Skaklia (141 m drop but unlike Raysko Praskalo it is seasonal) and Borov Kamak (63 m drop). The flora includes 1082 species of vascular plants and 186 species of mosses. The endemism is lowers when compared to the Central Balkan National Park — 6 Bulgarian and another 36 Balkan endemic species. The vertebrate fauna encompasses 276 species. The recorded mammal species are 58 and include gray wolf, golden jackal , wildcat, marbled polecat, European polecat , European pine marten and 22 bat species. The birds are 181 species, including 124 nesting ones. Typical species are

6486-441: 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

6580-410: The highest waterfalls in the Balkans and lush vegetation. There are a number of important nature reserves such as Chuprene, Kozyata stena and others. Most of Europe 's large mammals inhabit the area including the brown bear , wolf , boar , chamois and deer . The mountains are the source of the name of the Balkans (sometimes considered as a distinct peninsula or region). In Bulgarian and Serbian

6674-518: 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

6768-407: 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

6862-447: The local citizens on one, and contractors and their security guards on the other side, amidst the police interventions. In October 2018, Minister of Environmental Protection Goran Trivan , said that the current law allows for the micro hydros to be built in the protected areas. The government allowed the construction of 800 micro hydros, which has been described as "megalomaniacal" by the ecologists, as they would produce less than 1% of

6956-414: The mountain are already transformed into the aromatic herbs plantations, especially the entire slopes of the nearby mountains being planted with lavender . In the 1980s, fossils of Thecodontosaurus were discovered on the mountain. It is one of the oldest recorded species of dinosaurs, and the remains are estimated to be some 250 million years old. Some 190 species of butterflies are recorded. The area

7050-578: The mountain. Black Sea Unrecognised states: The Black Sea 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

7144-505: The mountains are also known as Стара планина Stara planina (pronounced in Bulgarian as [ˈstarɐ pɫɐniˈna] and in Serbian as [stâːraː planǐna] ), a term whose literal meaning is 'old mountain'. It is believed the name was brought to the region in the 7th century by Bulgars who applied it to the area, as a part of the First Bulgarian Empire . In Bulgarian , the archaic word balkan (балкан)

7238-541: The mountains, which were then named for this battle. Other names used to refer to the mountains in different time periods include Aemon , Haemimons , Hem , Emus , the Slavonic Matorni gori and the Turkish Kocabalkan . The Balkan Mountains are, technically, a chain of fold mountains —mountains formed by the compression and breaking of layers of rock. On a geological time scale , they are

7332-494: The name Haemus (Αἷμος) is derived from a Thracian word *saimon , 'mountain ridge'. The name of the place where the range meets the Black Sea, Cape Emine , is derived from Aemon . A folk etymology holds that 'Haemus' derives from the Greek word "haima" ( αἵμα ) meaning 'blood', and is based on Greek mythology. During a fight between Zeus and the monster/titan Typhon , Zeus injured Typhon with thunder; and Typhon's blood fell on

7426-431: 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

7520-561: The northern (black) and southern (red) seas : this points to the Achaemenids (550–330 BC). In the Greater Bundahishn , a Middle Persian Zoroastrian scripture, 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

7614-587: The one in north-eastern Greece. In recent years, several breeding pairs of griffon vulture have established themselves in the Vratsa Balkan to the west, as well as in the eastern sections of the Balkan Mountains. The eastern Balkan Mountains are among the priority areas in the reintroduction programme for the bearded vulture . Since the early XXI century there have been several records of the Eurasian lynx , which has been considered extincts in Bulgaria since

7708-454: 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

7802-507: 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

7896-488: 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

7990-561: The protected areas in Europe. Since 2017, its ancient beech forests have been included in the Primeval Beech Forests UNESCO World Heritage Site . It is the third largest protected territory in Bulgaria, spanning an area of 716.69 km with total length of 85 km from the west to the east and an average width of 10 km. Within its territory are located the highest summit of the mountain range, Botev Peak (2376 m), as well as

8084-493: 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

8178-464: 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 is divided into two depositional basins—the Western Black Sea and Eastern Black Sea—separated by

8272-527: The sea was called the "Inhospitable Sea Πόντος Ἄξεινος Póntos Áxeinos by the inhabitants of the Pontus region of 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

8366-468: The total electricity. Environmentalists also accused the government of destroying the plant and animal life using the pretext of renewable energy . In September 2019, Pirot city administration announced it is removing from the spatial plan all 43 existing locations for the micro hydros on the protected area of Stara Planina. There are 15 locations remaining in the unprotected sector of the mountain, but city officials announced abolishing of these locations in

8460-408: 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

8554-599: 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 the Black Sea from the rest of the global ocean system. The large shelf to

8648-787: Was borrowed from Turkic and means "mountain". It may have ultimately derived from the Persian bālkāneh or bālākhāna , meaning "high, above, or proud house." The name is still preserved in Central Asia with the Balkan Daglary (Balkan Mountains) and the Balkan Province of Turkmenistan . In Antiquity and the Middle Ages the mountains were known by their Thracian name: the Haemus Mons . Scholars consider that

8742-510: Was considered an ill omen and was euphemized to its opposite, Εὔξεινος Πόντος Eúxeinos Póntos (Hospitable Sea), also first attested in Pindar. This became 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

8836-421: Was declared a European Important Bird Area . The griffon vulture disappeared from the region in the late 1940s. In 2017 a program for their reintroduction began within the scope of a wider European program. Among other things, the feeders will be placed along the vultures' migratory route. By 2023, there were regular sightings of griffon vultures, and, thanks to the efforts of Bulgarian and Spanish ornithologists,

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