三江源 [ㄙㄢ ㄐㄧㄤ ㄩㄢˊ; san1 jiang1 yuan2] Sanjiangyuan National Nature Reserve, high plateau region of Qinghai containing the headwaters of Changjiang or Yangtze, Huanghe or Yellow River and Lancang or Mekong River ◄ ►