The so-called Heaven was actually just a general term.
If the Heaven that existed separately like the Abyss was a company, then the Heavens that were distributed across the Infinite Worlds could only be regarded as branch companies. These branch companies would sometimes have their own name according to their size or importance, such as the White City in the Darksiders world…
Roy had now entered Heaven through cracking a Gate of Heaven, which was naturally the Heaven of the Ashan world. Roy did not know if the Heaven here had a separate name, but the humans here had collectively called the place where angels came from 'Cloud City'.
Perhaps it was to maintain a sense of mystery or not wanting to interfere too much in the human world. In Roy's impression, angels liked to place their strongholds in every world in a Purgatory Space.