For example, are you asking about:
* A specific book or series of books called "Middle World"? If so, please specify the title and author.
* A specific fictional world in a book, video game, or other media? If so, please name the work and the world.
* A specific location or region within a fictional world? If so, please tell me which world.
Once you provide more information, I can help you determine the number of pages.