What does "sea of clouds" mean?

The sea of clouds refers to the clouds formed under certain weather conditions, and the height of the cloud top is lower than the top of the mountain. When people bow their heads at the top of the mountain, they see an endless sea of clouds, just like standing on the edge of the sea, giving people the feeling that the sea is surging, splashing and hitting the shore, so people call this phenomenon the "sea of clouds" during the day, and the colorful sea of clouds formed at sunrise and sunset is the most spectacular. Generally, this kind of spectacle can be seen on relatively high mountains.