C79 I'm Not Clean Anymore!
In the world, there are nine grand Heavenly Domains, and beneath these lie Nydidia. However, Nydidia is not literally a thousand desolate lands; it's a conceptual term. Furthermore, Nydidia is subdivided into nine sets of Hundred Desolate Lands, each associated with one of the Heavenly Domains.
There isn't a formal hierarchy between the Heavenly Domains and the barren lands