Believe it or not, it is Hong Kong!
In Hong Kong, sea of clouds usually appear in mountains 800m above sea level in winter and spring. You do not have too many choices and these mountains are: Tai Mo Shan (934m), Lantau Peak (934m), Sunset Peak (869m).
Lantau Peak is not a good place to stay for long due to little space at the peak, strong wind and low temperature. Therefore, it may not be a good choice.
Sunset Peak on Lantau Trail is the best place to view sea of clouds. There are more than 20 stone houses (Lantau Mountain Camp) on top of Sunset Peak. Although people cannot get inside those houses, camping near them is a good way to stay away from wind and cold. But please keep in mind that you can only camp on the designated areas required by the government. So take your own risk before you go.
Lugard Road on The Peak is another place at winter you may encounter the natural wonder during winter and spring; if you are lucky enough 🙂
Lantau Peak: 鳳凰山
Tai Mo Shan: 大帽山
Sunset Peak: 大東山
Lugard Road: 盧吉道