In ancient legends, the place where the seawater belongs (see Zhuangzi Qiushui) is now mostly used to refer to the lower reaches of the river.

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Ji Kang's Selected Works (On Health Preservation) quoted Sima Yun as saying: "Wei Lu, water comes from the sea, and it is also a lying book, in the East China Sea. The tail is called the tail under a hundred rivers; Lu, the land where people gather water, is called Lu. To the east of Fusang, there is a stone with a radius of 40,000 li and a thickness of 40,000 li. Those who inject seawater are exhausted, so they are named Lie Ben. "

It is at a very low altitude that it closes all the rivers.