Hello!
I have used the Zoomify software + the fantastic WordPress Embed Plugin to display one large map along with four smaller maps (the big one broken down into four images).
So I am essentially displaying 5 different Zoomify files on separate pages.
REF: https://darthvordclan.com/world-map/
I struggled a little with the initial set-up due to some stupid errors on my part (Zoomify’s Instructions not the WP Plugin) but once I figured out what was going on it has been good to play with.