Cloud sea refers to the clouds formed under certain weather conditions, and the height of the cloud top is lower than the height of the mountain top. When people look down at the top of the mountain, they see endless clouds, such as in the coast of the sea, surging waves, splashing waves, splashing the shore. So this phenomenon is called "cloud sea". So it's hard to see the cloud sea in the north, but unlike in Daheishan, if you're lucky, you can enjoy the cloud sea that you can't find, and you can also see the mirage of the sea.