Pathfinder 1E Pathfinder Chronicles setting: what does it offer?

[James Jacobs]

If you don't mind me asking:
• Where did this occur?
• Which supplement details it?

Thanks!

This happened in the nation of Numeria. It's been talked about in the Campaign Setting hardcover, and a LITTLE bit in Pathfinder #35, but we haven't really started developing Numeria and its strange alien mountain of metal and robots and mutants yet...