It is said that Mount Gangdise has three sons and one daughter. The eldest is named Yarlung Zangbo River, the second is named Shiquan River, the third is named Xiangquan River, and the younger sister is named Kongque River. One day, Mount Gangdise told Them: Now that you have grown up, it is time for you to take on the world. So the four brothers and sisters ran away on their own. When the eldest brother, the Brahmaputra River, flows here, he misses his younger brothers and sisters. After the goshawk in the sky told him that his younger brothers and sisters were all flowing southward, he was so anxious that he immediately rolled up huge waves, turned a big bend, and roared away towards the Indian Ocean, thus transforming into the Brahmaputra Grand Canyon.