The Yellow River, which originated in Qinghai, suddenly turned a corner in the Sichuan Ruoergai grassland when it passed through the junction of Qinghai, Gansu and Sichuan Provinces, and met the first big river Baihe in the Sichuan Ruoergai grassland, forming the first bay of the Jiuqu Yellow River in the 99th Bay of the Yellow River.