The Sanjiangyuan (), is an area of the Tibetan Plateau in Qinghai province, China which contains the headwaters of three great rivers of Asia: the Yellow, the Yangtze, and the Mekong. Parts of the area were protected as the Sanjiangyuan National Nature Reserve (SNNR), also called the Three Rivers Nature Reserve. The reserve consisted of 18 subareas, and each contained three zones which were managed with differing degrees of strictness. In 2015, the Chinese government decided to implement a new national park system, and created Sanjiangyuan National Park (SNP), which is set to open officially in 2020.