三江源 sānjiāng yuán

sānjiāng yuán proper noun Sanjiangyuan National Nature Reserve
Domain: Places 地方 , Subdomain: China , Concept: River 水名
Notes: A high plateau region of Qinghai containing the headwaters of Changjiang or Yangtze, Huanghe or Yellow River and Lancang or Mekong River (CC-CEDICT '三江源')