The Dangqu River (Chinese: 当曲, p Dāngqū) or Dam Chu (Tibetan: འདམ་ཆུ, w `Dam Chu, lit. `Marshy River`) is a river in Qinghai province in the People`s Republic of China. It is the geographic headwater of the Yangtze River, although the PRC officially recognizes the nearby Ulan Moron as the source. The Dangqu runs from its sour...