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83-581: It is located on the south-east coast of the Caspian Sea , in Balkan Province and covers an area of 2,690 km. Ogurjaly Sanctuary is part of this nature reserve. The climate is continental, the average annual temperature is 15 degrees Celsius. This Turkmenistan location article is a stub . You can help Misplaced Pages by expanding it . This article related to a protected area in Asia

166-705: A barrier against the Scythians. According to this historian, the people whom the Greeks called Scythians were known (among the Jews) as Magogites, descendants of the group called Magog in the Hebrew Bible. Josephus makes these references in two of his works. The Jewish War states that the iron gates Alexander erected were controlled by the king of Hyrcania (on the south edge of the Caspian), and allowing passage of

249-704: A cave in Georgia. Discoveries in the Hotu cave and the adjacent Kamarband cave , near the town of Behshahr , Mazandaran south of the Caspian in Iran, suggest human habitation of the area as early as 11,000 years ago. Ancient Greeks focused on the civilization on the south shore – they call it the (H)yr(c/k)anian Sea ( Ancient Greek : Υρκανία θάλαττα , with sources noting the latter word was evolving then to today's Thelessa : late Ancient Greek : θάλασσα ). Hafiz-i Abru ,

332-683: A fourteenth century Timurid Empire geographer, recorded that the destruction of the Oxus river dam and irrigation works diverted the river flow towards the Caspian Sea, which caused the Aral sea to nearly disappear. Later, in the Tang dynasty (618–907), the sea was the western limit of the Chinese Empire. The area is rich in fossil fuels . Oil wells were being dug in the region as early as

415-799: A gate. It is depicted in this way on Arabian world maps starting from the 10th century, as also on the Tabula Rogeriana , an influential map drawn in 1154 by Muhammad al-Idrisi for Roger II of Sicily . It is not clear which precise location Josephus meant when he described the Caspian gates. It may have been the Gates of Derbent (lying due east, nearer to Persia), or it may have been the Darial Gorge , lying west, bordering Iberia , located between present-day Ingushetia and Georgia . However, neither of these were within Hyrcania, but lay to

498-509: A great king building a great wall. Knowledge of Chinese innovations such as the compass and south-pointing chariot is known to have been diffused (and confused) across Eurasian trade routes. Other medieval literature, such as the Latin Frankish Chronicle of Fredegar in the first half of the seventh century and the tenth-century Armenian History of Movsēs Dasxurancʿi connected Alexander's gates especially to events during

581-541: A height of up to twenty meters and a thickness of about 10 feet (3 m) when it was in use. The Pass of Dariel or Darial has also been known as the "Gates of Alexander" and is a strong candidate for the identity of the Caspian Gates. An alternative theory links the Caspian Gates to the so-called "Alexander's Wall" (the Great Wall of Gorgan ) on the south-eastern shore of the Caspian Sea , 180 km of which

664-488: A result of the petrochemical industry; this has significantly decreased the number of species of marine birds in the area. Existing and planned oil and gas pipelines under the sea further increase the potential threat to the environment. The high concentration of mud volcanoes under the Caspian Sea were thought to be the cause of a fire that broke out 75 kilometers from Baku on July 5, 2021. The State oil company of Azerbaijan SOCAR said preliminary information indicated it

747-633: A source of diplomatic conflict between the Byzantines and the Sassanid Persians. When the current holder of the gates dies, he bequeaths it to Emperor Anastasius . Anastasius, unable and unwilling to finance a garrison for the gates, loses them in an assault by the Sassanid King Cabades ( Kavadh I ). After peace, Anastasius builds the city of Dara , which would be a focus point for war during the reign of Justinian and site of

830-645: A standard oceanic basalt and not a continental granite body. It is estimated to be about 30 million years old, and became landlocked in the Late Miocene , about 5.5 million years ago, due to tectonic uplift and a fall in sea level . The Caspian Sea was a comparatively small endorheic lake during the Pliocene , but its surface area increased fivefold around the time of the Pliocene-Pleistocene transition. During warm and dry climatic periods,

913-474: A symbolic boundary separating the civilized from the uncivilized world. The original Gates of Alexander were just south of the Caspian Sea , at Rhagae , where Alexander crossed while pursuing Darius III . The name was transferred to passes through the Caucasus, on the other side of the Caspian, by the more fanciful historians of Alexander. Various other passes in the Caucasus and Anatolia have been called

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996-567: Is a stub . You can help Misplaced Pages by expanding it . Caspian Sea The Caspian Sea is the world's largest inland body of water , described as the world's largest lake and usually referred to as a full-fledged sea . An endorheic basin , it lies between Europe and Asia : east of the Caucasus , west of the broad steppe of Central Asia , south of the fertile plains of Southern Russia in Eastern Europe , and north of

1079-484: Is a wholly freshwater species. The zebra mussel is native to the Caspian and Black Sea basins, but has become an invasive species elsewhere, when introduced. The area has given its name to several species, including the Caspian gull and the Caspian tern . The Caspian seal ( Pusa caspica ) is the only aquatic mammal endemic to the Caspian Sea, being one of very few seal species that live in inland waters, but it

1162-461: Is called Каспий теңізі , Kaspiy teñizi , Kyrgyz : Каспий деңизи , romanized :  Kaspiy deñizi , Uzbek : Kaspiy dengizi . Others refer to it as the Khazar sea : Turkmen : Hazar deňzi ; Azerbaijani : Xəzər dənizi , Turkish : Hazar Denizi . In all these the first word refers to the historical Khazar Khaganate , a large empire based to the north of the Caspian Sea between

1245-405: Is different from those inhabiting freshwaters due to the hydrological environment of the sea. A century ago the Caspian was home to more than one million seals . Today, fewer than 10% remain. Archeological studies of Gobustan Rock Art have identified what may be oceanic species including cetaceans from baleen whales to dolphins , and auks most likely Brunnich's Guillemot , although

1328-455: Is informed that Alexander had confined the Alans among other savage nations but that, either due to a bribe or political conflict, they were able to persuade the king of Hyrcania to let them burst out. Although not itself apocalyptic, the description of Ps. Hegesippus foreshadows the development of the apocalyptic narrative of Gog and Magog behind Alexander's wall, for it is first in his text that

1411-471: Is rather vague, described as a 50-day march away northwards after Alexander put to flight his Belsyrian enemies (the Bebrykes , of Bithynia in modern-day North Turkey ). The late antique Christian Syriac Alexander Legend transformed the gates into an apocalyptic barrier built by Alexander in the Caucasus to keep out the nations of Gog and Magog . This development was inspired by some elements of

1494-623: Is the Mangyshlak Threshold, which runs through Chechen Island and Cape Tiub-Karagan. The Middle–Southern boundary is the Apsheron Threshold , a sill of tectonic origin between the Eurasian continent and an oceanic remnant, that runs through Zhiloi Island and Cape Kuuli. The Garabogazköl Bay is the saline eastern inlet of the Caspian, which is part of Turkmenistan and at times has been a lake in its own right due to

1577-481: Is the deepest, with oceanic depths of over 1,000 m (3,300 ft), greatly exceeding the depth of other regional seas, such as the Persian Gulf . The Middle and Southern Caspian account for 33% and 66% of the total water volume, respectively. The northern portion of the Caspian Sea typically freezes in the winter, and in the coldest winters ice forms in the south as well. Over 130 rivers provide inflow to

1660-463: Is the largest inland body of water in the world by area and accounts for 40–44% of the total lake waters of the world, and covers an area larger than Germany . The coastlines of the Caspian are shared by Azerbaijan , Iran , Kazakhstan , Russia , and Turkmenistan . The Caspian is divided into three distinct physical regions: the Northern, Middle, and Southern Caspian. The Northern–Middle boundary

1743-696: The Alexander Romance of Pseudo-Callisthenes. This version locates the gates between two mountains called the "Breasts of the North" ( Greek : Μαζοί Βορρά ). The mountains are initially 18 feet apart and the pass is rather wide, but Alexander's prayers to God causes the mountains to draw nearer, thus narrowing the pass. There he builds the Caspian Gates out of bronze, coating them with fast-sticking oil. The gates enclosed twenty-two nations and their monarchs, including Gog and Magog (therein called "Goth and Magoth"). The geographic location of these mountains

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1826-703: The Abbacuch Sea (Oronce Fine's 1531 world map), Mar de Bachu (Ortellius' 1570 map), or Mar de Sala (the Mercator 1569 world map ). It was also sometimes called the Kumyk Sea and Tarki Sea (derived from the name of the Kumyks and their historical capital Tarki ). The Caspian Sea is at its South Caspian Basin , like the Black Sea , a remnant of the ancient Paratethys Sea . Its seafloor is, therefore,

1909-683: The Azerbaijan Academy of Sciences estimated that the level of the sea was dropping by more than six centimetres per year due to increased evaporation due to rising temperatures caused by climate change . The Volga River , the longest river in Europe, drains 20% of the European land area and is the source of 80% of the Caspian's inflow. Heavy development in its lower reaches has caused numerous unregulated releases of chemical and biological pollutants. The UN Environment Programme warns that

1992-593: The Battle of Dara . In this war, the Persians once again bring up the gates during negotiations, mentioning that they block the pass to the Huns for the benefit of both Persians and Byzantines, and that the Persians deserve to be compensated for their service. The story of Alexander's construction of walls to seal away and confine Gog and Magog is absent from the rabbinic literature . The Gates occur in later versions of

2075-655: The Black Sea . In the late Pontian stage , a mountain arch rose across the south basin and divided it into the Khachmaz and Lankaran Lakes (or early Balaxani ). The period of restriction to the south basin was reversed during the Akchagylian – the lake became more than three times its size today and took again the first of a series of contacts with the Black Sea and Aral Sea . A recession of Lake Akchagyl completed stage one. The earliest hominid remains found around

2158-788: The Ten Lost Tribes of Israel , who will emerge from their prison during the End Times and unite with their fellow Jews to attack the Christians . Polo speaks of Alexander's Iron Gates, but says the Comanians are the ones trapped behind it. He does mention Gog and Magog, however, locating them north of Cathay . Some scholars have taken this as an oblique and confused reference to the Great Wall of China , which he does not mention otherwise. The Gates of Alexander may represent an attempt by Westerners to explain stories from China of

2241-471: The Ural River discharge into the Caspian Sea, but it has no natural outflow other than by evaporation . Thus the Caspian ecosystem is a closed basin , with its own sea level history that is independent of the eustatic level of the world's oceans. The sea level of the Caspian has fallen and risen, often rapidly, many times over the centuries. Some Russian historians, such as Lev Gumilev , claim that

2324-604: The tidal areas of the Volga delta and riparian forests of the Samur River delta. The shoreline is also a unique refuge for plants adapted to the loose sands of the Central Asian Deserts . The principal limiting factors to successful establishment of plant species are hydrological imbalances within the surrounding deltas, water pollution , and various land reclamation activities. The water level change within

2407-401: The twelfth largest by nominal GDP and sixth largest by purchasing power parity in 2015. Russia's extensive mineral and energy resources are the largest such reserves in the world, making it the second leading producer of oil and natural gas globally. Caspian littoral states join efforts to develop infrastructure, tourism and trade in the region. The first Caspian Economic Forum

2490-411: The 10th century to reach oil "for use in everyday life, both for medicinal purposes and for heating and lighting in homes". By the 16th century, Europeans were aware of the rich oil and gas deposits locally. English traders Thomas Bannister and Jeffrey Duckett described the area around Baku as "a strange thing to behold, for there issueth out of the ground a marvelous quantity of oil, which serveth all

2573-617: The 7th and 10th centuries. In Iran, the lake is referred to as the Mazandaran Sea ( Persian : دریای مازندران ), after the historic Mazandaran Province at its southern shores. Old Russian sources use the Khvalyn or Khvalis Sea ( Хвалынское море / Хвалисское море ) after the name of Khwarezmia . Among Greeks and Persians in classical antiquity it was the Hyrcanian ocean. Renaissance European maps labelled it as

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2656-433: The Black Sea basin or widespread Palearctic species such as crucian carp , Prussian carp , common carp , common bream , common bleak , asp , white bream , sunbleak , common dace , common roach , common rudd , European chub , sichel , tench , European weatherfish , wels catfish , northern pike , burbot , European perch and zander . Almost 30 non-indigenous, introduced fish species have been reported from

2739-515: The Caspian "suffers from an enormous burden of pollution from oil extraction and refining, offshore oil fields, radioactive wastes from nuclear power plants and huge volumes of untreated sewage and industrial waste introduced mainly by the Volga River". The magnitude of fossil fuel extraction and transport activity in the Caspian also poses a risk to the environment. The island of Vulf off Baku , for example, has suffered ecological damage as

2822-524: The Caspian Gates, which he contrasts with the Gates of the Caucasus, a vast natural feature in a mountain chain rent asunder. Here, he says gates with iron covered beams have been placed above a horribly odorous river, along with a fortress to bar the passage of the innumerable tribes. These gates divide the world into two portions. Josephus , a Jewish historian in the 1st century, gives the first extant reference to gates constructed by Alexander, designed to be

2905-546: The Caspian Sea are from Dmanisi dating back to around 1.8 Ma and yielded a number of skeletal remains of Homo erectus or Homo ergaster . More later evidence for human occupation of the region came from a number of caves in Georgia and Azerbaijan such as Kudaro and Azykh Caves . There is evidence for Lower Palaeolithic human occupation south of the Caspian from western Alburz. These are Ganj Par and Darband Cave sites. Neanderthal remains also have been discovered at

2988-725: The Caspian Sea is an indirect reason for which plants may not get established. These affect aquatic plants of the Volga Delta, such as Aldrovanda vesiculosa and the native Nelumbo caspica . About 11 plant species are found in the Samur River delta, including the unique liana forests that date back to the Tertiary period . Since 2019 UNESCO has admitted the lush Hyrcanian forests of Mazandaran , Iran as World Heritage Site under category (ix). The Caspian turtle ( Mauremys caspica ), although found in neighboring areas,

3071-488: The Caspian Sea, but only a few have become established. Six sturgeon species, the Russian , bastard , Persian , sterlet , starry and beluga , are native to the Caspian Sea. The last of these is arguably the largest freshwater fish in the world . The sturgeon yield roe (eggs) that are processed into caviar . Overfishing has depleted a number of the historic fisheries. In recent years, overfishing has threatened

3154-431: The Caspian region economies are highly dependent on this type of mineral wealth. The world energy markets were influenced by Azerbaijan and Kazakhstan, as they became strategically crucial in this sphere, thus attracting the largest share of foreign direct investment (FDI). All of the countries are rich in solar energy and harnessing potential, with the highest rainfall much less than the mountains of central Europe in

3237-704: The Caspian, the Volga River being the largest. A second affluent, the Ural River , flows in from the north, and the Kura River from the west. In the past, the Amu Darya (Oxus) of Central Asia in the east often changed course to empty into the Caspian through a now-desiccated riverbed called the Uzboy River , as did the Syr Darya farther north. The Caspian has several small islands, primarily located in

3320-518: The Gates of Alexander since at least the 1st century CE. Later, the Caspian Gates were also identified with the Pass of Derbent (in modern Dagestan ) on the Caspian; or with the Pass of Dariel , a gorge forming a pass between Georgia and North Ossetia–Alania . Tradition also connects it to the Great Wall of Gorgan (Red Snake) on its south-eastern shore. These fortifications were historically part of

3403-645: The North Caspian, the majority of the islands are small and uninhabited, like the Tyuleniy Archipelago , an Important Bird Area (IBA). The climate of the Caspian Sea is variable, with the cold desert climate (BWk), cold semi-arid climate (BSk), and humid continental climate (Dsa, Dfa) being present in the northern portions of the Caspian Sea, while the Mediterranean climate (Csa) and humid subtropical climate (Cfa) are present in

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3486-529: The Protection of the Caspian Sea against Pollution from Land-based Sources in order to ensure better protection for the biodiversity of the Caspian Sea. The rising level of the Caspian Sea between 1995 and 1996 reduced the number of habitats for rare species of aquatic vegetation. This has been attributed to a general lack of seeding material in newly formed coastal lagoons and water bodies. Many rare and endemic plant species of Russia are associated with

3569-587: The Seleucid calendrical system which began in 1 October, 312 BCE; by subtracting 311 or 312, a date of 514/5 is arrived at, representing a vaticinium ex eventu . A second prophecy of an incursion appears for 940 SE, pinpointing to 628/9 AD and corresponds with the invasion of Armenia by the Turkic Khazars (not to be confused with a reference to the Turks which may not occur in this type of literature until

3652-637: The Two Horns"), a righteous ruler and conqueror who reached the west and the east. The barrier was constructed with melted iron sheets and covered with copper. During the Middle Ages , the Gates of Alexander story was included in travel literature such as the Travels of Marco Polo and the Travels of Sir John Mandeville . The identities of the nations trapped behind the wall are not always consistent, however; Mandeville claims Gog and Magog are really

3735-641: The amount of North Atlantic depressions that reach the interior, and they in turn are affected by cycles of the North Atlantic oscillation . Thus levels in the Caspian Sea relate to atmospheric conditions in the North Atlantic, thousands of kilometres to the northwest. The last short-term sea-level cycle started with a sea-level fall of 3 m (10 ft) from 1929 to 1977, followed by a rise of 3 m (10 ft) from 1977 until 1995. Since then smaller oscillations have taken place. A study by

3818-434: The ancient inhabitants of its coast perceived the Caspian Sea as an ocean, probably because of its salinity and large size. With a surface area of 371,000 square kilometres (143,000 sq mi), the Caspian Sea is nearly five times as big as Lake Superior (82,000 square kilometres (32,000 sq mi)). The Caspian Sea is home to a wide range of species and is famous for its caviar and oil industries. Pollution from

3901-457: The climate to the southwest and south are generally warm with uneven elevation due to a mix of highlands and mountain ranges ; the drastic changes in climate alongside the Caspian have led to a great deal of biodiversity in the region. The Caspian Sea has numerous islands near the coasts, but none in the deeper parts of the sea. Ogurja Ada is the largest island. The island is 37 km (23 mi) long, with gazelles roaming freely on it. In

3984-595: The construction by Alexander of an iron gate to section off the barbarian group. In the first of two references to this gate, Ps. Hegesippus, places its location at the Taurus Mountains . This is mentioned in the context of a discussion on Alexander's founding of the Antioch of the Orontes , and therefore represents Alexander not only as a founder of civilization but also its protector. In the second reference, it

4067-536: The countries of the Romans and Persians; they will shoot arrows with armagest and will return and enter their country. Moreover, I wrote that (at) the end of eight hundred and twenty six years, the Huns would come forth by the narrow road..." (the inscription goes on for several more pages). This prophecy whereby the Huns break through the gates is linked to the invasion of the Sabir people in 515 AD as Syriac texts would use

4150-439: The country of the Albanians ( Caucasian Albania , not to be confused with the country of Albania ) belongs also the territory called Caspiane, which was named after the Caspian tribe, as was also the sea; but the tribe has now disappeared". Moreover, the Caspian Gates , part of Iran 's Tehran province , may evince such people migrated to the south. The Iranian city of Qazvin shares the root of its name with this common name for

4233-423: The country to burn in their houses. This oil is black and is called nefte . There is also by the town of Baku, another kind of oil which is white and very precious [i.e., petroleum ]." Today, oil and gas platforms abound along the edges of the sea. During the rule of Peter I the Great , Fedor I. Soimonov was a pioneering explorer of the sea. He was a hydrographer who charted and greatly expanded knowledge of

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4316-426: The current Caspian Sea and either the Arctic Ocean or North Sea , or the Black Sea . This is supported by the existences of current endemic, oceanic species such as lagoon cockles which was genetically identified to originate in the Caspian and Black Seas regions. The sea's basin (including associated waters such as rivers) has 160 native species and subspecies of fish in more than 60 genera . About 62% of

4399-460: The defence lines built by the Sassanid Persians , while the Great Wall of Gorgan may have been built by the Parthians . Alongside other motifs such as the Horns of Alexander , the Gates of Alexander became commonly associated with Alexander legends, as in the Alexander Romance , the Syriac Alexander Romance , and the Qissat Dhulqarnayn . Pliny the Elder (23 AD – 25 August 79 AD), in his Natural History , says that Alexander passed through

4482-415: The fish stocks, since it targets reproductive females. Reptiles native to the region include the spur-thighed tortoise ( Testudo graeca buxtoni ) and Horsfield's tortoise . The main geologic history locally had two stages. The first is the Miocene , determined by tectonic events that correlate with the closing of the Tethys Sea . The second is the Pleistocene noted for its glaciation cycles and

4565-424: The full run of the present Volga. During the first stage, the Tethys Sea had evolved into the Sarmatian Lake, that was created from the modern Black Sea and south Caspian, when the collision of the Arabian peninsula with West Asia pushed up the Kopet Dag and Caucasus Mountains , lasting south and west limits to the basin. This orogenic movement was continuous, while the Caspian was regularly disconnected from

4648-436: The gate should be constructed out of iron and bronze, for which he recruited three thousand blacksmiths to work the latter and three thousand other men for the former. However, it was believed that the barbarian tribes would break through during the apocalypse. The dimensions and features of the gate are described in detail, and Alexander was said to have placed an inscription on it which reads "The Huns will come forth and subdue

4731-459: The gates to the Alans (whom Josephus considered a Scythic tribe) resulted in the sack of Media . Josephus's Antiquities of the Jews contains two relevant passages, one giving the ancestry of Scythians as descendants of Magog son of Japheth , and another that refers to the Caspian Gates being breached by Scythians allied to Tiberius during the Armenian War . In his description of the Alans , Pseudo-Hegesippus follows Josephus in mentioning

4814-461: The historical context of the time, including dread of the northern hordes, a variety of Persian fortifications meant to seal off the movement of steppe nomads, and eschatological thinking and attitudes of the time. At its outset, the Syriac Alexander Legend (otherwise known as the Neshana ) records Alexander constructing a wall of iron to prevent an invasion of the Huns that would result in the plunder of peoples and countries. Alexander commanded that

4897-421: The isthmus that cuts it off from the Caspian. Differences between the three regions are dramatic. The Northern Caspian only includes the Caspian shelf, and is very shallow; it accounts for less than 1% of the total water volume with an average depth of only 5–6 m (16–20 ft). The sea noticeably drops off towards the Middle Caspian, where the average depth is 190 m (620 ft). The Southern Caspian

4980-421: The landlocked sea almost dried up, depositing evaporitic sediments like halite that were covered by wind-blown deposits and were sealed off as an evaporite sink when cool, wet climates refilled the basin. (Comparable evaporite beds underlie the Mediterranean .) Due to the current inflow of fresh water in the north, the Caspian Sea water is almost fresh in its northern portions, getting more brackish toward

5063-419: The mountainous Iranian Plateau . It covers a surface area of 371,000 km (143,000 sq mi) (excluding the highly saline lagoon of Garabogazköl to its east), an area approximately equal to that of Japan , with a volume of 78,200 km (19,000 cu mi). It has a salinity of approximately 1.2% (12 g/L), about a third of the salinity of average seawater . It is bounded by Kazakhstan to

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5146-453: The mountains of the west, which are also rich in hydroelectricity sources. Iran has high fossil fuel energy potential. It has reserves of 137.5 billion barrels of crude oil , the fourth largest in the world, producing around four million barrels a day. Iran has an estimated 988.4 trillion cubic feet of natural gas , around 16 percent of world reserves, thus key to current paradigms in global energy security. Russia's economy ranks as

5229-409: The ninth century), although this may have been an interpolation that was made into the text during the reign of Heraclius to update the narrative for a contemporary political situation. The description of the gates of Alexander in the Syriac Alexander Legend influenced most subsequent Syriac literature describing these events. More indirect, the Tiburtine Sibyl records that Alexander "enclosed"

5312-411: The north and west of its boundaries. Another suggestion is some mountain pass in the Taurus-Zagros Mountains , somewhere near Rhaegae, Iran , in the heart of Hyrcania. The Gates of Alexander are most commonly identified with the Caspian Gates of Derbent , whose thirty north-looking towers used to stretch for forty kilometers between the Caspian Sea and the Caucasus Mountains , effectively blocking

5395-426: The north with a collective land area of roughly 2,000 km (770 sq mi). Adjacent to the North Caspian is the Caspian Depression , a low-lying region 27 m (89 ft) below sea level . The Central Asian steppes stretch across the northeast coast, while the Caucasus mountains hug the western shore. The biomes to both the north and east are characterized by cold, continental deserts. Conversely,

5478-402: The northeast, Russia to the northwest, Azerbaijan to the southwest, Iran to the south, and Turkmenistan to the southeast. The name of the Caspian sea is derived from the ancient Iranic Caspi people. The sea stretches 1,200 km (750 mi) from north to south, with an average width of 320 km (200 mi). Its gross coverage is 386,400 km (149,200 sq mi) and

5561-458: The notion is developed that the tribe behind the wall have actually been confined or imprisoned behind it. Jerome states in the late-fourth century in his seventy-seventh letter that "the gates of Alexander keep back the wild peoples behind the Caucasus". Like Ps. Hegesippus, and unlike the later traditions of the Syrian church, Jerome was concerned with the Greco-Roman discourses on civilization and barbarity as opposed to apocalypse. Jordanes

5644-440: The oil industry and dams on rivers that drain into it have harmed its ecology. It is predicted that during the 21st century, the depth of the sea will decrease by 9–18 m (30–60 ft) due to global warming and the process of desertification , leading to an ecocide . The sea's name stems from Caspi , the ancient people who lived to the southwest of the sea in Transcaucasia . Strabo (died circa AD 24) wrote that "to

5727-399: The passage across the Caucasus. Derbent was built around a Sassanid Persian fortress, which served as a strategic location protecting the empire from attacks by the Gokturks . The historical Caspian Gates were not built until probably the reign of Khosrow I in the 6th century, long after Alexander's time, but they came to be credited to him in the passing centuries. The immense wall had

5810-425: The people of Gog and Magog to prevent their incursion from the north, coinciding with the statement that at some point in the future they will rise again and break through. A similar narration is mentioned in al-Kahf (" The Cave "), the 18th chapter of the Quran . According to the Quranic narrative, Gog and Magog ( Arabic : يأجوج ومأجوج Yaʾjūj wa-Maʾjūj ) were walled off by Dhu al-Qarnayn ("possessor of

5893-491: The reign of Heraclius , the Byzantine emperor who defeated the Sasanian Empire in their great war of the first decades of the seventh century. The medieval German legend of the Red Jews was partially based on stories of the Gates of Alexander. The legend disappeared before the 17th century. In medieval world maps, the land of Gog and Magog is generally shown as a region in the far north, northeast, or east of Asia , enclosed by mountains or fortifications and often featuring

5976-518: The rising of the Caspian in the 10th century caused the coastal towns of Khazaria to flood, resulting in the Khazars losing approximately two-thirds of their territory due to flooding. Over the centuries, Caspian Sea levels have changed in synchrony with the estimated discharge of the Volga, which in turn depends on rainfall levels in its vast catchment basin. Precipitation is related to variations in

6059-470: The rock art on Kichikdash Mountain which is assumed to depict either a beaked whale or a dolphin , it may represent the famous beluga sturgeon instead due to its size (430 cm in length). These petroglyphs may suggest potential presences of oceanic faunas in the Caspian Sea presumably until the Quaternary or even the last glacial period or antiquity due to historic marine inflow between

6142-496: The sea. He drew a set of four maps and wrote Pilot of the Caspian Sea , the first lengthy report and modern maps. These were published in 1720 by the Russian Academy of Sciences . Countries in the Caspian region, particularly Azerbaijan , Kazakhstan and Turkmenistan , have high-value natural-resource-based economies, where the oil and gas compose more than 10 percent of their GDP and 40 percent of their exports. All

6225-635: The sea. The traditional and medieval Arabic name for the sea was Baḥr ('sea') Khazar , but in recent centuries the common and standard name in Arabic language has become بحر قزوين Baḥr Qazvin , the Arabized form of Caspian. In modern Russian language, it is known as Russian : Каспи́йское мо́ре , Kaspiyskoye more . Some Turkic ethnic groups refer to it with the Caspi(an) descriptor; in Kazakh it

6308-459: The south. It is most saline on the Iranian shore, where the catchment basin contributes little flow. Currently, the mean salinity of the Caspian is one third that of Earth's oceans. The Garabogazköl lagoon , which dried up when water flow from the main body of the Caspian was blocked in the 1980s but has since been restored, routinely exceeds oceanic salinity by a factor of 10. The Caspian Sea

6391-405: The southern portions of the Caspian Sea. The Caspian has characteristics common to both seas and lakes. It is often listed as the world's largest lake, although it is not freshwater : the 1.2% salinity classes it with brackish water bodies. It contains about 3.5 times as much water, by volume, as all five of North America's Great Lakes combined. The Volga River (about 80% of the inflow) and

6474-905: The species and subspecies are endemic , as are 4–6 genera (depending on taxonomic treatment). The lake proper has 115 natives, including 73 endemics (63.5%). Among the more than 50 genera in the lake proper, 3–4 are endemic: Anatirostrum , Caspiomyzon , Chasar (often included in Ponticola ) and Hyrcanogobius . By far the most numerous families in the lake proper are gobies (35 species and subspecies), cyprinids (32) and clupeids (22). Two particularly rich genera are Alosa with 18 endemic species/subspecies and Benthophilus with 16 endemic species. Other examples of endemics are four species of Clupeonella , Gobio volgensis , two Rutilus , three Sabanejewia , Stenodus leucichthys , two Salmo , two Mesogobius and three Neogobius . Most non-endemic natives are either shared with

6557-421: The sturgeon population to the point that environmentalists advocate banning sturgeon fishing completely until the population recovers. The high price of sturgeon caviar – more than 1,500 Azerbaijani manats (US$ 880 as of April 2019 ) per kilo – allows fishermen to afford bribes to ensure the authorities look the other way, making regulations in many locations ineffective. Caviar harvesting further endangers

6640-503: The surface is about 27 m (89 ft) below sea level . Its main freshwater inflow , Europe's longest river, the Volga , enters at the shallow north end. Two deep basins form its central and southern zones. These lead to horizontal differences in temperature, salinity, and ecology. The seabed in the south reaches 1,023 m (3,356 ft) below sea level, which is the third-lowest natural non-oceanic depression on Earth after Baikal and Tanganyika lakes. Written accounts from

6723-694: Was a Byzantine author of the sixth century. In a detailed discussion on the Amazons in a Latin work of his named the Getica , he wrote that Alexander had built a set of gates and called them the Caspian Gates. These gates, he said, were guarded by the Laz people of Roman Georgia . The Gates are also mentioned in Procopius ' History of the Wars: Book I. Here they are mentioned as the Caspian Gates and they are

6806-458: Was a mud volcano which spewed both mud and flammable gas. It is calculated that during the 21st century, the water level of the Caspian Sea will decrease by 9–18 m (30–60 ft) due to the acceleration of evaporation due to global warming and the process of desertification , causing an ecocide . On October 23, 2021, Kazakhstan President Kassym-Jomart Tokayev signed the Protocol for

6889-560: Was convened on August 12, 2019, in Turkmenistan and brought together representatives of Kazakhstan, Russia, Azerbaijan, Iran and that state. It hosted several meetings of their ministers of economy and transport. Caspian Gates The Gates of Alexander , also known as the Caspian Gates , are one of several mountain passes in eastern Anatolia , the Caucasus , and Persia , often imagined as an actual fortification, or as

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