Why is Binzhou Zhonghai called Zhonghai?

Binzhou Zhonghai is called Zhonghai because the "Five Seas" among the four rings and five seas are designed with the theme of "Heaven, Earth, People and Water" respectively. The theme of Zhonghai is "Heaven", and the outstanding design concepts are the sun, the moon and the stars. At the same time, China Sun Island, as a landmark, should also show Binzhou's broad mind facing the future as a coastal city through reform and opening up.