I am working on a reboot of the Hoarfrost Saga, now the mega-dungeon is the long abandoned dwarf citadel known as the Hoarfrost Halls. It is the northern most white icon in the middle map. The northern city (in the middle map) is called Gjoll.
The hexes are 10 mile hexes and the smaller hexes are 2 miles.
I am still working on details obviously.