The Tokko (russian: Токко) is a river in

Yakutia Sakha, officially the Republic of Sakha (Yakutia),, is the largest republic of Russia, located in the Russian Far East, along the Arctic Ocean, with a population of roughly 1 million. Sakha comprises half of the area of its governing Far ...

, East Siberia,

Russian Federation Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia North Asia or Northern Asia, also referred to as Siberia, is the northern region of Asia, which is defined in geographic ...

. It is the largest tributary of the Chara river in terms of length and area of its basin. The river is long and has a drainage basin of . It is navigable in its final stretch, from its confluence with the Chara. Tokko village is located by the river bank.Tokko
/ ''

Great Soviet Encyclopedia The ''Great Soviet Encyclopedia'' (GSE; ) is one of the largest Russian-language encyclopedias, published in the Soviet Union from 1926 to 1990. After 2002, the encyclopedia's data was partially included into the later ''Bolshaya rossiyskaya e ...

:'' in 30 vols. / Ch. ed. A.M. Prokhorov. - 3rd ed. - M. Soviet Encyclopedia, 1969-1978. The Chara-Tokkinskaya group of deposits (Чара-Токкинская группа месторождений), the largest

iron ore Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the ...

accumulation in Russia, is located in the Tokko basin. Rock art depictions of ancient hunters dating back to the 1st - 2nd millennia BC have been preserved on a

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms wh ...

ridge rising to above the river's right bank from its mouth. The waters of the Tokko are rich in fish, including grayling,

lenok Lenoks, otherwise known as Asiatic trout or Manchurian trout,James Card: Fly fishing in South Korea.' Retrieved 22 June 2015. are salmonid fish of the genus ''Brachymystax'', native to rivers and lakes in Mongolia, Kazakhstan, wider Siberia (incl ...

taimen Siberian taimen (''Hucho taimen''), also known as the common taimen (russian: Обыкнове́нный тайме́нь, Obyknovénnyĭ taĭménʹ), Siberian giant trout or Siberian salmon, is a species of salmon-like ray-finned fish from the ...

pike Pike, Pikes or The Pike may refer to: Fish * Blue pike or blue walleye, an extinct color morph of the yellow walleye ''Sander vitreus'' * Ctenoluciidae, the "pike characins", some species of which are commonly known as pikes * ''Esox'', genus o ...

and

common dace The common dace (''Leuciscus leuciscus'') is a species of freshwater and brackish water ray-finned fish from the family Cyprinidae which is native to Europe but which has been introduced to other parts of the world. It is a quarry species for coa ...

, among other species.Tokko - Water of Russia
/ref>

Course

The Tokko is a right tributary of the Chara, of the

Lena Lena or LENA may refer to: Places * Léna Department, a department of Houet Province in Burkina Faso * Lena, Manitoba, an unincorporated community located in Killarney-Turtle Mountain municipality in Manitoba, Canada * Lena, Norway, a village in ...

basin. Its source is in a

glacial lake A glacial lake is a body of water with origins from glacier activity. They are formed when a glacier erodes the land and then melts, filling the depression created by the glacier. Formation Near the end of the last glacial period, roughly 10, ...

located on the southeastern slopes of a nameless high peak of the Udokan Range, a subrange of the

Stanovoy Highlands The Stanovoy Highlands ( rus, Станово́е наго́рье) or Stanovoy Uplands is a mountain range in the Transbaikal region of Siberia, Russia. Geography The Stanovoy Highlands are a mountainous area between the Patom Highlands to the n ...

, very near the border of

Transbaikalia Transbaikal, Trans-Baikal, Transbaikalia ( rus, Забайка́лье, r=Zabaykalye, p=zəbɐjˈkalʲjɪ), or Dauria (, ''Dauriya'') is a mountainous region to the east of or "beyond" (trans-) Lake Baikal in Far Eastern Russia. The steppe and ...

. Google Earth In its upper course the Tokko flows northwards across the Olyokma-Chara Plateau in the

Olyokminsky District Olyokminsky District (russian: Олёкминский улу́с; sah, Өлүөхүмэ улууһа, ''Ölüökhüme uluuha'') is an administrativeConstitution of the Sakha Republic and municipalLaw #172-Z #351-III district (raion, or ''ulus''), ...

through a

U-shaped valley U-shaped valleys, also called trough valleys or glacial troughs, are formed by the process of glaciation. They are characteristic of mountain glaciation in particular. They have a characteristic U shape in cross-section, with steep, straight s ...

bound by smooth mountains. At about from its mouth the Tokko enters a deep valley where it narrows to a maximum of and forms

rapids Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence. Rapids are hydrological features between a ''run'' (a smoothly flowing part of a stream) and a ''cascade' ...

. further downstream, after the confluence of the Choruoda, one of its main tributaries, the Tokko enters a wide

floodplain A floodplain or flood plain or bottomlands is an area of land adjacent to a river which stretches from the banks of its channel to the base of the enclosing valley walls, and which experiences flooding during periods of high discharge.Goudi ...

where it slows down, divides into arms and forms

meanders A meander is one of a series of regular sinuous curves in the channel of a river or other watercourse. It is produced as a watercourse erodes the sediments of an outer, concave bank ( cut bank) and deposits sediments on an inner, convex bank ...

. Finally it joins the Chara from this river's mouth in the Olyokma. The longest tributaries of the Tokko are the long Choruoda, The long Torgo and the long Teene (Тээнэ) from the right, and the long Kebekte, the long Upper Dzhege (Верхняя Джеге) and the long Ulakhan-Segeeleennekh (Улахан-Сэгэлээннээх) from the left. The river is frozen in most of its length between mid October and mid May, but there are places where

polynya A polynya () is an area of open water surrounded by sea ice. It is now used as a geographical term for an area of unfrozen seawater within otherwise contiguous pack ice or fast ice. It is a loanword from the Russian полынья (), which r ...

s form. There are about 1,700 lakes in the basin area of the Tokko.

References

Rivers of the Sakha Republic Stanovoy Highlands {{Russia-river-stub

Course

See also

References