Chu River

From Kazakhstan Encyclopedia

"Chui River" and "Chuy River" redirect here. For the river of Anhui see Chu River (Anhui). For the South American Chuí or Chuy River, on the Brazil-Uruguay border and Brazil's southernmost point, see Chuí Stream. For the Nam Sam River or Chu River, on the Lao-Vietnam border, see Nam Sam River.


The Chu (Shu or Chui, Chuy) (Template:Lang-kk/Şuw, شۋ; Template:Lang-ky, Çüy, چۉي; Template:Lang-dng, Çw; Template:Lang-ru) is a river in northern Kyrgyzstan and southern Kazakhstan. Of the length of approximately 1 067 kilometres[1] (663 miles), the first 115 kilometres are in Kyrgyzystan, then for 221 kilometres the river is the border between Kyrgyzystan and Kazakhstan, and the last 731 kilometres are in Kazakhstan. It's one of the longest rivers in Kyrgyzstan and in Kazakhstan.

Chuy Region, the northernmost and most populous administrative region of Kyrgyzstan, is named after the river; so are the Chuy Avenue, the main street of Bishkek, and the city of Shu in Kazakhstan's Jambyl Region.


The Chu River is formed by the confluence of rivers Joon Aryk and Kochkor in Kochkor District of Naryn Region. After approaching Lake Issyk Kul within a few kilometers (near Balykchy), without either flowing into the lake or draining it, it turns to the northwest. In the 1950s an old riverbed called Ketmaldy (also Buugan) linked the Chu River and Issyk Kul. During floods part of Chu water would reach the lake, but such outflow has not be seen since construction of the Orto-Tokoy Reservoir. After passing through the narrow Boom Gorge (Template:Lang-ru, Boomskoye ushchelye), the river enters the comparatively flat Chuy Valley, within which the Kyrgyz capital of Bishkek and the Kazakh city of Shu are located. Much of the Chu's water is diverted into a network of canals to irrigate the fertile black soils of the Chuy Valley for farming, both on the Kyrgyz and Kazakh sides of the river.

As the Chu flows through the Chuy Valley, it forms the border between Kyrgyzstan and Kazakhstan for more than a hundred kilometers, but then it leaves Kyrgyzstan and flows into Kazakhstan, where, like many other rivers and streams that drain northern Kyrgyzstan it eventually disappears in the steppe, short of reaching the Syr Darya, although it has sometimes reached that river in wet years.


Chu River in the Syr Darya basin

The area of this river was originally home to the Iranian Sughds who spoke Soghdian, an East Iranian language.[2]

During the Middle Ages, the area was strategically important. It was the setting of Suayub, the capital of the Western Turkic Khaganate, and Balasagun, the capital of the Kara-Khitans.

Chu River posed a risk of flooding for settlements located in Chu Valley. In winter 1878, an ice gorge formed on Chu River upstream town Tokmok that was the center of Semirechye Province. This was followed by severe flooding that damaged the town and the center of the province was moved to Pishpek (Bishkek). After this, Tokmak gradually lost its significance.[3]


The river flow is regulated by the dam at Orto-Tokoy Reservoir in Kyrgyzstan built in 1957, and the dam at Tasotkel Reservoir in Kazakhstan built in 1974.

Ecology and environment

Environmental monitoring

The Kyrgyz State Agency on Hydrometeorology and Kazakhstan Hydrometeorological Service (Kazhydromet) operate a number of water quality monitoring stations on the Chu River and its tributaries.[4]

Water quality

According to Kyrgyz State Agency on Hydrometeorology, in 2004–08, water pollution index of the Chu River in Chu Valley ranged from 0.25 to 0.7 units that is interpreted as Class II ("Clean water"). The only exception was a monitoring point downstream Vasilyevka village where water pollution index ranged from 0.4 to 1.2 unit and water quality was assessed as Class II(Clean)/Class III ("Moderately polluted").[4]

According to Kazakhstan Hydrometeorological Service (Kazhydromet), water pollution index of Shu (Chu) River in Jambyl Region of Kazakhstan amounted to 2.01 (Class III, "Moderately polluted") in 2008, and 1.83 (Class III, "Moderately polluted") in 2009. Such water quality parameters as biochemical oxygen demand, nitrites, copper, phenols exceeded the maximum allowable concentrations.[5]

Major tributaries

In Kyrgyzstan, 4892 rivers and canals flow into Chu River.[6] The list of the major tributaries include:



  1. Great Soviet Encyclopedia
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