Why are some discs marked as "Asia" rather than specifying the countries?
E.g. for the Wii the Taiwan/Hong Kong/China discs are marked simply as "Asia", but other country combinations (on other systems at least) are marked as "Asia" too, seemingly contradicting that.

For many systems it's a proper region with its own range of serials, like, UCAS for PSP, SCPS-45xxx for PS1, etc. For Saturn the China is a standalone region, so these should be marked as China rather than Asia.