Lake Ladoga | |
---|---|
Location | Northwestern Russia (Leningrad Oblast and the Republic of Karelia) |
Coordinates | 61°00′N31°30′E / 61.000°N 31.500°E |
Primary inflows | Svir, Volkhov, Vuoksi |
Primary outflows | Neva |
Catchment area | 276,000 km2 (107,000 sq mi) |
Basin countries | Russia Finland (minor) |
Max. length | 219 km (136 mi) |
Max. width | 138 km (86 mi) |
Surface area | 17,891 km2 (6,908 sq mi) |
Average depth | 47.3 m (155 ft) |
Max. depth | 230–260 m (750–850 ft) |
Water volume | 837 km3 (201 cu mi) |
Surface elevation | 5 m (16 ft) |
Islands | about 660 (including Valaam) |
Settlements | see list |
Lake Ladoga [a] is a freshwater lake located in the Republic of Karelia and Leningrad Oblast in northwestern Russia, in the vicinity of Saint Petersburg.
It is the largest lake located entirely in Europe, the second largest lake in Russia after Lake Baikal, and the 14th largest freshwater lake by area in the world. It is comparable in size to Lake Ontario. Ladoga Lacus , a methane lake on Saturn's moon Titan, is named after the lake.
In one of Nestor's chronicles from the 12th century a lake called "the Great Nevo" is mentioned, a clear link to the Neva River and possibly further to Finnish nevo 'sea' or neva 'bog, quagmire'. [1]
Ancient Norse sagas and Hanseatic treaties both mention a city made of lakes named Old Norse Aldeigja or Aldoga. [2] Since the beginning of the 14th century this hydronym was commonly known as Ladoga. According to T. N. Jackson, it can be taken "almost for granted that the name of Ladoga first referred to the river, then the city, and only then the lake". Therefore, he considers the primary hydronym Ladoga to originate in the eponymous inflow to the lower reaches of the Volkhov River whose early Finnic name was Alodejoki (corresponding to modern Finnish : Alojen joki) 'river of the lowlands'. [1]
The Germanic toponym (Aldeigja ~ Aldoga) was soon borrowed by the Slavic population and transformed by means of the Old East Slavic metathesis ald- → lad- to Old East Slavic : Ладога. The Old Norse intermediary word between Finnish and Old East Slavic word is fully supported by archeology, since the Scandinavians first appeared in Ladoga in the early 750s, that is, a couple of decades before the Slavs. [3]
Other hypotheses about the origin of the name derive it from Karelian : aalto 'wave' and Karelian : aaltokas 'wavy', or from the Russian dialectal word алодь, meaning 'open lake, extensive water field'. [4] Eugene Helimski by contrast, offers an etymology rooted in German. In his opinion, the primary name of the lake was Old Norse : *Aldauga 'old source', associated to the open sea, in contrast to the name of the Neva River (flowing from Lake Ladoga) which would derive from the German expression for 'the new'. Through the intermediate form *Aldaugja, Old Norse : Aldeigja came about, referring to the city of Ladoga. [5]
The lake has an average surface area of 17,891 km2 (excluding the islands), slightly larger than Kuwait. Its north-to-south length is 219 km and its average width is 83 km; the average depth is 47 m, although it reaches a maximum of 230 m in the north-western part. Basin area: 276,000 km2, volume: 837 km3 [6] (earlier estimated as 908 km3). There are around 660 islands, with a total area of about 435 km2. Ladoga is, on average, 5 m above sea level. [7] Most of the islands, including the famous Valaam archipelago, Kilpola and Konevets, are situated in the northwest of the lake.
Separated from the Baltic Sea by the Karelian Isthmus, it drains into the Gulf of Finland via the Neva River.
Lake Ladoga is navigable, being a part of the Volga–Baltic Waterway connecting the Baltic Sea with the Volga River. The Ladoga Canal bypasses the lake in the south, connecting the Neva to the Svir.
The basin of Lake Ladoga includes about 50,000 lakes and 3,500 rivers longer than 10 km. About 85% of the water inflow is due to tributaries, 13% is due to precipitation, and 2% is due to underground waters.
Geologically, the Lake Ladoga depression is a graben and syncline structure of Proterozoic age (Precambrian). This "Ladoga–Pasha structure", as it is known, hosts Jotnian sediments. During the Pleistocene glaciations the depression was partially stripped of its sedimentary rock fill by glacial overdeepening. [8] During the Last Glacial Maximum, about 17,000 years BP, the lake served likely as a channel that concentrated ice of the Fennoscandian Ice Sheet into an ice stream that fed glacier lobes further east. [9]
Deglaciation following the Weichselian glaciation took place in the Lake Ladoga basin between 12,500 and 11,500 radiocarbon years BP. Lake Ladoga was initially part of the Baltic Ice Lake (70–80 m. above present sea level), a historical freshwater stage of Baltic Sea. It is possible, though not certain, that Ladoga was isolated from it during regression of the subsequent Yoldia Sea brackish stage (10,200–9,500 BP). The isolation threshold should be at Heinjoki to the east of Vyborg, where the Baltic Sea and Ladoga were connected by a strait or a river outlet at least until the formation of the River Neva, and possibly even much later, until the 12th century AD or so. [10] [11]
At 9,500 BP, Lake Onega, previously draining into the White Sea, started emptying into Ladoga via the River Svir. Between 9,500 and 9,100 BP, during the transgression of Ancylus Lake, the next freshwater stage of the Baltic, Ladoga certainly became part of it, even if they hadn't been connected immediately before. During the Ancylus Lake subsequent regression, around 8,800 BP Ladoga became isolated. [12]
Ladoga slowly transgressed in its southern part due to uplift of the Baltic Shield in the north. It has been hypothesized, but not proven, that waters of the Litorina Sea, the next brackish-water stage of the Baltic, occasionally invaded Ladoga between 7,000 and 5,000 BP. Around 5,000 BP the waters of the Saimaa Lake penetrated Salpausselkä and formed a new outlet, River Vuoksi, entering Lake Ladoga in the northwestern corner and raising its level by 1–2 m. [13]
The River Neva originated when the Ladoga waters at last broke through the threshold at Porogi into the lower portions of Izhora River, then a tributary of the Gulf of Finland, between 4,000 and 2,000 BP. Dating of some sediments in the northwestern part of Lake Ladoga suggests it happened at 3,100 radiocarbon years BP (3,410–3,250 calendar years BP). [14]
The Ladoga is rich with fish. 48 forms (species and infra specific taxa) of fish have been encountered in the lake, including roach, carp bream, zander, European perch, ruffe, endemic variety of smelt, two varieties of Coregonus albula (vendace), eight varieties of Coregonus lavaretus, a number of other Salmonidae as well as, albeit rarely, endangered Atlantic sturgeon (formerly confused with European sea sturgeon). Commercial fishing was once a major industry but has been hurt by overfishing. After the war, between 1945 and 1954, the total annual catch increased and reached a maximum of 4,900 tonnes. However, unbalanced fishery led to the drastic decrease of catch in 1955–1963, sometimes to 1,600 tonnes per year. Trawling has been forbidden in Lake Ladoga since 1956 and some other restrictions were imposed. The situation gradually recovered, and in 1971–1990 the catch ranged between 4,900 and 6,900 tonnes per year, about the same level as the total catch in 1938. [15] Fish farms and recreational fishing are developing. [16]
It has its own endemic ringed seal subspecies known as the Ladoga seal.
Since the beginning of the 1960s Ladoga has become considerably eutrophicated. [17]
Nizhnesvirsky Natural Reserve is situated along the shore of Lake Ladoga immediately to the north of the mouth of the River Svir.
The Ladoga has a population of Arctic char that is genetically close to the chars of Lake Sommen and Lake Vättern in southern Sweden. [18]
In the Middle Ages, the lake formed a vital part of the trade route from the Varangians to the Eastern Roman Empire, with the Norse emporium at Staraya Ladoga defending the mouth of the Volkhov since the 8th century. In the course of the Swedish–Novgorodian Wars, the area was disputed between the Novgorod Republic and Sweden. In the early 14th century, the fortresses of Korela (Kexholm) and Oreshek (Nöteborg) were established along the banks of the lake.
During the Russo-Swedish War of 1656–1658, the Swedes deployed several armed vessels (called Lodja) on lake Ladoga to combat the Russians though no large sea battles were fought. [19]
The ancient Valaam Monastery was founded on the island of Valaam, the largest in Lake Ladoga, abandoned between 1611 and 1715, restored in the 18th century, and evacuated to Finland during the Winter War in 1940. In 1989 the monastic activities in the Valaam were resumed. Other historic cloisters in the vicinity are the Konevets Monastery, which sits on the Konevets island, and the Alexander-Svirsky Monastery, which preserves samples of medieval Muscovite architecture.
During the Ingrian War, a fraction of the Ladoga coast was occupied by Sweden. In 1617, by the Treaty of Stolbovo, the northern and western coast was ceded by Russia to Sweden. In 1721, after the Great Northern War, it was restitutioned to Russia by the Treaty of Nystad. In the 18th century, the Ladoga Canal was built to bypass the lake which was prone to winds and storms that destroyed hundreds of cargo ships. [20]
Later, from around 1812–1940 the lake was shared between Finland and Russia. According to the conditions of the 1920 Tartu Peace Treaty militarization of the lake was severely restricted. However, both Soviet Russia and Finland had flotillas in Ladoga (see also Finnish Ladoga Naval Detachment). After the Winter War (1939–40) according to the Moscow Peace Treaty, Ladoga, previously shared with Finland, became an internal basin of the Soviet Union.
During World War II not only Finnish and Soviet, but also German and Italian vessels operated there (see also Naval Detachment K and Regia Marina). Under these circumstances, during much of the Siege of Leningrad (1941–44), Lake Ladoga provided the only access to the besieged city as a section of the eastern shore remained in Soviet hands. Supplies were transported into Leningrad with trucks on winter roads over the ice, the "Road of Life", and by boat in the summer. After World War II, Finland lost the Karelia region again to the USSR, and all Finnish citizens were evacuated from the ceded territory. Ladoga became an internal Soviet basin once again. The northern shore, Ladoga Karelia with the town of Sortavala, is now part of the Republic of Karelia. The western shore, Karelian Isthmus, became part of Leningrad Oblast.
The Neva is a river in northwestern Russia flowing from Lake Ladoga through the western part of Leningrad Oblast to the Neva Bay of the Gulf of Finland. Despite its modest length of 74 kilometres (46 mi), it is the fourth-largest river in Europe in terms of average discharge.
The Karelian Isthmus is the approximately 45–110-kilometre-wide (30–70 mi) stretch of land situated between the Gulf of Finland and Lake Ladoga in northwestern Russia, to the north of the River Neva. Its northwestern boundary is a line from the Bay of Vyborg to the westernmost point of Lake Ladoga, Pekonlahti. If the Karelian Isthmus is defined as the entire territory of present-day Saint Petersburg and Leningrad Oblast to the north of the Neva and also a tiny part of the Republic of Karelia, the area of the isthmus is about 15,000 km2 (5,800 sq mi).
The Valaam Monastery is a stauropegic Orthodox monastery in Russian Karelia, located on Valaam, the largest island in Lake Ladoga, the largest lake in Europe.
Lake Onega is a lake in northwestern Russia, on the territory of the Republic of Karelia, Leningrad Oblast and Vologda Oblast. It belongs to the basin of the Baltic Sea, and is the second-largest lake in Europe after Lake Ladoga, slightly smaller than Lebanon. The lake is fed by about 50 rivers and is drained by the Svir.
Leningrad Oblast is a federal subject of Russia. The oblast has an area of 84,500 square kilometres (32,600 sq mi) and a population of 2,000,997 ; up from 1,716,868 recorded in the 2010 Census. Leningrad Oblast is highly industrialized. Its administrative center and largest city is Gatchina.
The Vuoksi is a river running through the northernmost part of the Karelian Isthmus from Lake Saimaa in southeastern Finland to Lake Ladoga in northwestern Russia. The river enters Lake Ladoga in three branches, an older main northern branch at Priozersk (Käkisalmi), a smaller branch a few kilometers to the north of it, and a new southern branch entering 50 kilometers (31 mi) further southeast as Burnaya River, which has become the main stream in terms of water discharge. Since 1857, the old northern distributaries drain only the lower reaches of the Vuoksi basin and are not fed by Lake Saimaa. The northern and southern branches actually belong to two separate river systems, which at times get isolated from each other in dry seasons.
The Svir is a river in Podporozhsky, Lodeynopolsky, and Volkhovsky districts in the north-east of Leningrad Oblast, Russia. It flows westwards from Lake Onega to Lake Ladoga, thus connecting the two largest lakes of Europe. It is the largest river flowing into Lake Ladoga. The length of the Svir is 224 kilometres (139 mi), whereas the area of its drainage basin is 84,400 square kilometres (32,600 sq mi). The towns of Podporozhye and Lodeynoye Pole, as well as urban-type settlements Voznesenye, Nikolsky, Vazhiny, and Svirstroy are located at the banks of the Svir.
Karelia is an area in Northern Europe of historical significance for Russia, Finland, and Sweden. It is currently divided between northwestern Russia and Finland.
The Volkhov is a river in Novgorodsky and Chudovsky Districts of Novgorod Oblast and Kirishsky and Volkhovsky Districts of Leningrad Oblast in northwestern Russia. The Volkhov, which forms part of the basin of the Neva, is the only outflow of Lake Ilmen, and connects it with Lake Ladoga. The length of the Volkhov is 224 kilometres (139 mi), and the area of its drainage basin is 80,200 square kilometres (31,000 sq mi). The city of Veliky Novgorod, the towns of Kirishi, Volkhov and Novaya Ladoga, and the historically important village of Staraya Ladoga are located along the Volkhov.
The Vyborg–Petrozavodsk offensive or Karelian offensive was a strategic operation by the Soviet Leningrad and Karelian Fronts against Finland on the Karelian Isthmus and East Karelia fronts of the Continuation War, on the Eastern Front of World War II. The Soviet forces captured East Karelia and Vyborg/Viipuri. After that, however, the fighting reached a stalemate.
Priozersky District is an administrative and municipal district (raion), one of the seventeen in Leningrad Oblast, Russia. It is located in the northwest of the oblast and borders with Lakhdenpokhsky District of the Republic of Karelia in the north, Vsevolozhsky District in the south, and Vyborgsky District in the west. In the east, the district is bounded by Lake Ladoga. The area of the district is 3,597.5 square kilometers (1,389.0 sq mi). Its administrative center is the town of Priozersk. Population : 43,260 (2010 Census); 42,859 ; 40,231 (1989 Soviet census).
The old Karelian railroad between Viipuri and Joensuu was a 1,524 mm broad gauge line that used to link Joensuu, Sortavala, Hiitola, Antrea and Viipuri. Originally built in 1892-1894 by Finnish State Railways in the Grand Duchy of Finland, in the 1940s most of the railway up to Niirala was ceded by Finland to the Soviet Union in the Moscow Peace Treaty, Moscow Armistice and Paris Peace Treaty as a result of the Winter War and Continuation War. Now the track is located in Leningrad Oblast, Republic of Karelia and North Karelia. The Sortavala–Joensuu link across the border was abolished after the Continuation War, but was since restored and is currently in use for cargo traffic.
Konevets is an approximately 8.5-km² island famous as the site of the Konevsky Monastery. It is located off the southwestern shore of Lake Ladoga near the village of Vladimirovka. The island is part of the Priozersky District of Leningrad Oblast. The nearest town is Priozersk, which is located 40 km away from the island. The island of Valaam is 60 km away and Saint Petersburg is 170 km away by boat. There is a ferry link from Vladimirovka that makes the 6.5-km trip in 40–50 minutes.
Finnish Lakeland or Finnish lake district is the largest of the four landscape regions into which the geography of Finland is divided.
The Ladoga Canal is a historical water transport route, now situated in Leningrad Oblast, linking the Neva and the Svir River so as to bypass the stormy waters of Lake Ladoga which lies immediately to the northwest. It is about 117 kilometres (73 mi) long and comprises two distinct but overgrown canals, Old Ladoga Canal and New Ladoga Canal, running in parallel from Sviritsa on the Svir through Novaya Ladoga on the Volkhov to Shlisselburg on the Neva.
Freshwater seals are pinnipeds which live in freshwater bodies. The group is paraphyletic in nature, the uniting factor being the environment in which these pinnipeds live. The vast majority of all modern seals live solely in saltwater habitats though this is likely due to the rarity of sufficiently large freshwater bodies rather than the limitation of seal biology.
Lodeynopolsky District is an administrative and municipal district (raion), one of the seventeen in Leningrad Oblast, Russia. It is located in the northeast of the oblast and borders with Olonetsky District of the Republic of Karelia in the north, Podporozhsky District in the east, Tikhvinsky District in the south, and Volkhovsky District in the west. The area of the district is 4,900 square kilometers (1,900 sq mi). Its administrative center is the town of Lodeynoye Pole. Population : 9,795 (2010 Census); 12,185 ; 13,426 (1989 Soviet census).
The Ileksa is a river in Onezhsky District of Arkhangelsk Oblast and Pudozhsky District of the Republic of Karelia in Russia. It is the principal tributary of Lake Vodlozero, and thus belongs to the basins of Lake Onega and of the Baltic Sea. It is 155 kilometres (96 mi) long, and the area of its basin 3,950 square kilometres (1,530 sq mi). The main tributary of the Ileksa is the Chusreka (left).
Lake Komsomolskoye is a lake in the north of the Leningrad Region Priozersky District, in the middle of the Karelian Isthmus of north western Russia. Until 1948 it was called Kiimajärvi.
The I Corps refers to several short-lived units of the Finnish Army before and during the Continuation War. The longest-lived I Corps participated in both the Finnish invasion of Ladoga Karelia and the Finnish invasion of the Karelian Isthmus in 1941 before being disbanded in early 1942, before being re-designated V Corps.