Are there any sources which have (at least somewhat) detailed information about general locations in Stygia other than Ankhwugat or Sheyruushk? I found something called the Black Kingdom on the internets on which I can't find any info.
The reason for asking is my gamers will be visiting Stygia soon for certain reasons, and I have plenty of details regarding Tantlin and certain specific sites, but far less about territories in general. I'd like to be able to tie in their story to something bigger.
And if there are no significant sources, do you have any suggestions on what canonical information not to run afoul of while creating new territories?