# Chirkuo

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The **Chirkuo** (Russian: Чиркуо) is a river in [Yakutia](/source/Yakutia) ([Sakha Republic](/source/Sakha_Republic)), [Russia](/source/Russia). It is a right hand tributary of the [Vilyuy](/source/Vilyuy), and is 118 kilometres (73 mi) long —206 kilometres (128 mi) including the Duikhta at its head, with a [drainage basin](/source/Drainage_basin) of 7,710 square kilometres (2,980 sq mi).[1]

In the Ust-Chirkuo Site (sah: Чиркуо төрдө) there are remains of ancient settlements by the river.[2] Currently there are no permanent inhabited places in the river area.[3]

## Course

The Chirkuo lies in the upper stretch of the Vilyuy basin. It begins at the confluence of the Duikhta and the Kucchuchi-Chuurka (Куччучи-Чуурка) in the [Vilyuy Plateau](/source/Vilyuy_Plateau). The river flows roughly northwards across the plateau along the border with [Irkutsk Oblast](/source/Irkutsk_Oblast) to the west. Finally it meets the right bank of the Vilyuy 1,712 km (1,064 mi) from its mouth in the Lena. The river freezes between mid October and late May.[4]

The main tributaries of the Chirkuo are the 120 kilometres (75 mi) long Golusakh and the 88 kilometres (55 mi) long [Dulisma](/source/Dulisma) from the left. The last stretch and mouth area of the Chirkuo are part of the backwater of the [Vilyuy Reservoir](/source/Vilyuy_Reservoir).[5]

## Fauna

The waters of the Chirkuo provide a habitat for the [critically endangered](/source/Critically_endangered) [Siberian sturgeon](/source/Siberian_sturgeon).[6]

## See also

- [List of rivers of Russia](/source/List_of_rivers_of_Russia)
- [Vilyuy Dam](/source/Vilyuy_Dam)

## References

1. [Taymyr : the archaeology of northernmost Eurasia"](https://archive.org/stream/taymyrarchaeolog52005khlo/taymyrarchaeolog52005khlo_djvu.txt)

1. ["P-49-50 Topographic Chart (in Russian)"](https://maps.vlasenko.net/smtm1000/p-49_50.jpg). Retrieved 5 April 2023.

1. [Nature.ykt](https://web.archive.org/web/20080613135415/http://www.nature.ykt.ru/RIAC/Yakutia_geogr/023.htm#%D0%A7%D0%B8%D1%80%D0%BA%D1%83%D0%BE)

1. [Influence of the Vilyui hydropower plant on the regime of the Vilyui river](https://iopscience.iop.org/article/10.1088/1755-1315/579/1/012031/pdf)

1. [Sturgeon biodiversity and conservation](http://awsassets.panda.org/downloads/2_2007_sturgeon_biodiversity_and_cons_birstein_at__al__usa_1.pdf)

## External links

- [Ancient Cultures and Migrations in Northeastern Siberia](https://www.academia.edu/87804110/_2022_Ancient_Cultures_and_Migrations_in_Northeastern_Siberia)
- [Species structure, contemporary distribution and status of the Siberian sturgeon *Acipenser baerii*](https://www.researchgate.net/publication/226116320_Species_structure_contemporary_distribution_and_status_of_the_Siberian_surgeon_Acipenser_baerii)

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