C1654 Cloud sky city
Cloud Sky City!
It was a city, but at the same time, it was also a sacred place. Thus, the city was named.
Most cities would choose to stay in a flat and open area, and very few would build their cities on top of a mountain peak. Cloud Sky City was one of the latter kind, a city that was built on top of a mountain peak.
In fact, there weren't even that many of the eighty-one realms of Humans