Bhote Koshi in Nepal and Poiqu in Tibet (both names roughly mean "Tibetan river") is the name given to the upper course (main tributary) of the Sun Kosi river. It is part of the

Koshi River The Kosi or Koshi is a transboundary river which flows through China, Nepal and India. It drains the northern slopes of the Himalayas in Tibet and the southern slopes in Nepal. From a major confluence of tributaries north of the Chatra Gorge onw ...

system in

Nepal Nepal, officially the Federal Democratic Republic of Nepal, is a landlocked country in South Asia. It is mainly situated in the Himalayas, but also includes parts of the Indo-Gangetic Plain. It borders the Tibet Autonomous Region of China Ch ...

.Shrestha, A. B., Eriksson, M., Mool, P., Ghimire, P., Mishra, B., & Khanal, N. R. (2010). Glacial lake outburst flood risk assessment of Sun Koshi basin, Nepal. Geomatics, Natural Hazards and Risk 1(2): 157–169.

Names and etymology

''Bhote koshi'' is the Nepalese name (). In

Nepali language Nepali (; , ), or ''Gorkhali'' is an Indo-Aryan languages, Indo-Aryan language native to the Himalayas region of South Asia. It is the official and most widely spoken Languages of Nepal, language of Nepal, where it also serves as a ''lingua fr ...

, the word "bhoṭe" or "bhoṭiyā" means Tibetan; and the word "kosi" means river. As such, the name is not unique, the western tributary of the upper Dudh Koshi is also called Bhote Koshi. It was called Po Chu () by early 1990s Everest expeditions, which name means the "river of Tibet." It is spelt ''Poiqu'' or ''Boqu'' () in Chinese sources. The Tibetan name of the river is Matsang Tsangpo ().

River course

The headwaters of the Poiqu and Bhote-Sun Koshi River are located at the Zhangzangbo

Glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...

in Tibet.Bajracharya, S. R., Mool, P. K., Shrestha, B. R. (2006). The impact of global warming on the glaciers of the Himalaya. Pages 231–242 in: Proceedings of the International Symposium on Geodisasters, Infrastructure Management and Protection of World Heritage Sites. Nepal Engineering College, Ehime College and National Society for Earthquake Technology Nepal. The river flows out of the Lumi Chimi lake. When entering Nepal, it is called the Bhote Koshi. Further downstream, from the village of Bahrabise onwards, it is called the Sun Koshi.

Hazards

In July 1981, a sudden ice

avalanche An avalanche is a rapid flow of snow down a Grade (slope), slope, such as a hill or mountain. Avalanches can be triggered spontaneously, by factors such as increased precipitation or snowpack weakening, or by external means such as humans, othe ...

caused a

Glacial Lake Outburst Flood A glacial lake outburst flood (GLOF) is a type of outburst flood caused by the failure of a dam containing a glacial lake. An event similar to a GLOF, where a body of water contained by a glacier melts or overflows the glacier, is called a j� ...

in the

moraine A moraine is any accumulation of unconsolidated debris (regolith and Rock (geology), rock), sometimes referred to as glacial till, that occurs in both currently and formerly glaciated regions, and that has been previously carried along by a gla ...

-dammed Zhangzangbu-Cho Lake in the headwaters of the Bhote Koshi. The ensuing

debris Debris (, ) is rubble, wreckage, ruins, litter and discarded waste, garbage/refuse/trash, scattered remains of something destroyed, or, as in geology, large rock fragments left by a melting glacier, etc. Depending on context, ''debris'' can ref ...

flow destroyed bridges, and sections of both the Arniko and the Nepal–China highways.Mool, P. K.; Joshi, S. P.; Bajracharya, S. R. (2001). Glacial Lake Outburst Floods and Damage in the Country. Pages 121–136 in: Inventory of Glaciers, Glacial Lakes and Glacial Lake Outburst Floods: Monitoring and Early Warning Systems in the Hindu Kush-Himalayan Region, Nepal. International Centre for Integrated Mountain Development, Kathmandu.

Tourism and sports

The Bhote Kosi is used for both

rafting Rafting and whitewater rafting are recreational outdoor activities which use an inflatable raft to navigate a river or other body of water. This is often done on whitewater or different degrees of rough water. Dealing with risk is often a ...

and

kayaking Kayaking is the use of a kayak for moving over water. It is distinguished from canoeing by the sitting position of the paddler and the number of blades on the paddle. A kayak is a low-to-the-water, canoe-like boat in which the paddler sits fac ...

. It is the steepest river rafted in Nepal, with a gradient of 15 m per km. Bungee jumping or swinging over the Bhote Kosi has been described as the ‘ultimate experience’. The river carves a steep and direct drop at the top that gradually eases to more placid streams and calmer pools with a 46-km run at the Lamosunga dam. The rapids are class IV-V at high flow, and III at lower levels. The river is steep and continuous with one rapid leading into another.

References

External links

Bhote Kosi River
(Upper Sun Kosi), OpenStreetMap, retrieved 19 December 2021.
Sun Kosi River
OpenStreetMap, retrieved 19 December 2021.
Arun River
OpenStreetMap, retrieved 19 December 2021.
Sapta Kosi River
OpenStreetMap, retrieved 19 December 2021. {{Kosi basin Rivers of Tibet Rivers of Bagmati Province International rivers of Asia