Been running a PF1e Rappan Athuk campaign (going on 4 years now) that's looking like it'll most likely wrap up by the end of the year.
With that, I was planning what next, so I ended up making this huge map to encapsulate multiple future games. Main plan is to do the Ashardalon Cycle from 3e and three 3rd party 3e psionic adventures for the main focus (then used a bunch of Dungeon Magazine adventures and some of my own homebrew as filler.
While setting that up, I decided to find a way to tie the Ashardalon stuff into the same world as the Rappan Athuk game I was running. Opted to utilize The Stoneheart Valley and Bard's Gate for the link. And then things just expanded from there to encapsulate a couple of the Shadowdark Cursed Scroll hexcrawls.
Whenever there were any discrepancies with hex size based on the source material, I just made the hexes 6 miles. Planning on breaking down into Detail Maps for actual gameplay, to make keying the hexes less of a headache.
I was inspired to do this by watching both D&D Homebrew's video "Old School Mapmaking" and Red Mage GM's video "I Compiled the Ultimate OSR Dolmenwood Campaign Map for New Dungeon Masters".
Just wanted to share, hope y'all enjoy!