The Tongtian River (Chinese: 通天河, Tōngtiān Hé) or Zhi Qu (Tibetan) is a 1,012 km (629 mi) long river in Qinghai Province in western China. It begins at the confluence of the Ulan Moron and Dangqu rivers, before flowing southeast and meeting the Jinsha River near the border of Qinghai and Sichuan. It is part of the Yangtze River drainage basin.
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👉 Tongtian River in the context of Dangqu
The Dangqu, Dam Qu (Chinese: 当曲, p Dāngqū) or Dam Chu (Tibetan: འདམ་ཆུ, w 'Dam Chu, lit. "Marshy River") is the longest source of the Yangtze River, with a total length of 365.7 km (227.2 mi) located in the Qinghai province of the People's Republic of China. It runs from its source in an eastern offshoot of the Tanggula Mountains (唐古拉山), receives its main tributary the Buqu-Gar Qu River (布曲), and has a confluence with the Ulan Moron, where the Tongtian River is formed. The Dangqu has been discovered to be the actual and the longest headwater of the Yangtze River under modern criteria, although the nearby Ulan Moron or Tuotuo was traditionally regarded as the primary river of the two.
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Tongtian River in the context of Ulan Moron
The Ulan Moron (Mongolian: ᠤᠯᠠᠭᠠᠨᠮᠥᠷᠡᠨ, Ulaan Mörön, lit. "Red River"; Chinese: 乌兰木伦, p Wūlánmùlún), Mar Qu (Tibetan), or Tuotuo River (沱沱河, p Tuótuó Hé, lit. "Tearful River"; Tibetan: ཐོག་ཐོག་ཆུ་, ZWPY: Togtog Qu) is the second longest source of the Yangtze River after Dangqu River, with a total length of 361.4 km (224.6 mi) long, located in Qinghai province in the People's Republic of China.
The Ulan Moron begins as melt-off from the Geladandong glaciers and runs to a confluence with the Dangqu or Dam Chu River, where they form the Tongtian River, which subsequently becomes the Yangtze River. Although the Dangqu has been found to be the longest source of the Yangtze under the usual modern criteria, the Ulan Moron has been traditionally regarded as the main river and source. It belongs to the East China Sea watershed basin.