The Dalai Lama, Geshe Lobsang Gyatso and many other escaped at first using traditional Kowa boats while escaping to india from Lhasa, Tibet

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The river that flows through Lhasa is the Lhasa River, also known in Tibetan as the Kyichu (or Gyiqoi), which translates to "Happy River". 

Key Facts About the Lhasa River

Source: It originates from the southern foothills of the Nyainqentanglha Mountains on the Qinghai-Tibet Plateau. 
Length: It stretches approximately 320 to 350 miles (500 to 551 kilometers) long. 
Course: It runs through the Chengguan district of Lhasa and eventually joins the major Yarlung Tsangpo River (the upper stream of the Brahmaputra) in Chushur County. 
Cultural Significance: Known as the "Mother River" of Tibetans, locals frequently gather along its banks and valleys to relax, picnic, fish, and celebrate traditional events like the Bathing Festival. 

If you'd like, I can share more details about local attractions near the river or the best times of year to visit Lhasa.

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  Wikipedia

  Lhasa River - Wikipedia

  The Lhasa River, also called Kyi Chu is a northern tributary of the Yarlung Tsangpo River in the south of the Tibet Autonomous Reg...

  
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  Tibet Vista

  5 Days Lhasa and Kyichu River Rafting Tour - Tibet Vista

  Overview: Lhasa River, also called Kyichu River in Tibetan, originating from Nyainqentanglha Mountain on the Qinghai-Tibet Plateau...

  

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