Asian Themed Post Apocalyptic Fantasy

[oscarrob]

What I recall was Asian royalty living with space and privilege while cities were super crowded and couldn't be left. I think some part of the story revolved around discovery of what was beyond/under the city. This was a very long time ago, maybe more than 40 years that I read at least one of the series and its all very vague. An odd symbol on the front of the book and I want to say the author last name began with a W, but I can't be sure.