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Tarim River

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The Tarim River is a massive, shifting waterway in Xinjiang, China. It is the longest inland river in the country. An endorheic river is a type of river that does not reach the ocean. Instead, its water stays within a closed basin. The Tarim River flows through the Tarim Basin, a desert region located between the Tian Shan and Kunlun Mountains. This river is vital because it provides life to an extremely dry environment.

Tarim Desert Highway - Crossing the Tarim River, Xinjiang, China
Tarim Desert Highway - Crossing the Tarim River, Xinjiang, China

This river system works through a process of mountain runoff and collection. The water originates in the Karakoram Mountains and several other surrounding ranges. There are 144 rivers that feed into this centripetal water system. These include the Tianshan, Pamir, Karakoram, Kunlun, and Altun Mountains. The river is primarily fed by glaciers and melting snow. Because of this, the water volume changes with the seasons. Between June and September, melting snow causes floods. This period accounts for 70% to 80% of the annual runoff. In contrast, the winter months see much lower water levels. The river actually freezes over every year from December through March.

The Tarim River is formed by the union of several major tributaries. Near Aral City, the Aksu River flows from the north to meet the Yarkand River from the southwest. The Yarkand River is the main source of the system. It begins at the southeastern foot of Mount Telim Kanli. A third river, the Khotan River, also joins this area, though it is often dry when it arrives. The Aksu River is the most important tributary of all. It supplies 70% to 80% of the total water volume. The total average annual water volume at the confluence of the three major sources is 4.299 billion cubic meters. The Aksu River contributes 3.358 billion of those cubic meters.

Geologists and historians view the Tarim as a highly unstable river. It is a braided stream, which means it has many shallow channels that split and rejoin. This happens because the river carries a very heavy silt load. Silt is fine sand and sediment that the water carries along. Because of this sediment, the river is too shallow for navigation. The river's course also changes frequently. In the 2nd century AD, the Greek geographer Ptolemy called it the Oichardes River. During the Qing dynasty, it was called "Erse Gol," which is Mongolian for "flowing water." The name "Tarim" itself may mean "horse without reins." This name describes how the river frequently diverts from its original path.

The river's path is divided into three distinct sections. The upper section is above Yangji Baza. In this area, the riverbed is unstable and the water erodes the sides strongly. The middle section runs from Yangji Baza to Qunke. Here, the terrain is gentle and creates many depressions. The water flows in a disordered network of forks, lakes, and swamps. During floods, the water overflows and disperses into these areas. The lower section begins below Qunke. In this final part, the river channel becomes more unified and restored. Historically, the river reached Lop Nur. Today, it often dries out before reaching it, reaching only as far as Taitema Lake.

Despite the harsh desert, the river supports incredible biological diversity. The Tarim River Basin contains the world's largest primitive Populus euphratica forest. These are special poplar trees that grow in the river valley. Other plants include willow, sea buckthorn, and tamarisk. These plants create a corridor of life in the sand. Many animals depend on this water. You can find Tarim red deer and wild Bactrian camels here. Migratory birds, such as whooper swans and egrets, use the lakes as stopover points. However, these forests are currently disappearing. This is because the water volume has decreased due to human use and river cut-offs.

Human activity has significantly changed how the river functions. In 1921, a major change occurred when the main stream was diverted east. In 1952, a dam was built near Yuli County. This dam separated the river from the Kongque River. As a result, water now flows back to Taitema Lake through the old Tieganlik road. Humans also use the water for irrigation and farming. This has caused the water volume in the main stream to decrease. In the 1950s, the water volume was about 6 billion cubic meters. By the start of the 21st century, it had dropped to 4.4 billion cubic meters. This is an average decrease of 320 million cubic meters every decade.

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