Tianjin Jinghai is the origin of Jinghai of hippocampus.

The appellation of place names in China generally follows a law. Where there is a mountain, there must be a mountain, where there is water, there must be water, and where there is sea, there must be sea. However, in the south of Tianjin, there is a place called Jinghai, which is not only the sea, but also more than 50 kilometers away from the Bohai Sea. Then the sea of tranquility can't touch the sea at all. Why do you need a word "sea" in a place name?

This is actually caused by the passage of time.

Because the coastline is not fixed, the rise and fall of the earth's crust and the fluctuation of sea water may all cause changes in the coastline. In the long years, due to the large amount of sediment carried by rivers, the land has been continuously extended to the ocean. It used to be near the sea, but now it is getting farther and farther away from the sea.

And why the sea of tranquility is not close to the sea is also based on this factor. In fact, Haixing, Haiyang, Haizhou and Haian are actually similar to the situation in Jinghai. They used to be adjacent to the sea, but later they gradually moved away from the sea with the change of years.

Therefore, Jinghai is not the sea, but the name brings the sea. You see why!