Introduction to Chashan Sea of ​​Clouds: Chashan is close to the sea. Every spring, summer and autumn, fog appears on the sea surface, and the valleys and ravines are filled with fairy air, just like a fairy mountain and a palace. When the fog is light, the mountains are wisps of thin air, mysterious and misty; when the fog is thick, only the peaks are exposed, like a green boat floating on the sea, which is particularly spectacular.