Erhai Lake, once called Ye Yuze, Kunmichuan, Xier River and Xier River in ancient literature, is located in the north of Dali City, Dali Bai Autonomous Prefecture, Yunnan Province. It is named Erhai Lake because it looks like a person's ear. Although it is called the sea, it is actually a lake. It is said that because Bai people have never seen the sea, it is called Erhai Lake to show their yearning for the sea.