The Underdark 3.5 campaign
is almost over after 4 years, from 3rd level to 17th. I don't do epic stuff, too involved. Folks are welcome to download whatever maps are available, as the campaign will be removed shortly after the new one starts.
Anyhow, there are maps on the new campaign, which actually as involved and detailed as they are, fit right into Maptools from another source. This was actually a region map of somewhere in Europe, all names changed to protect the innocent and painted over for forests, oceans, rivers and whatnot.
My players don't know it, but they're starting out like a normal campaign but about to go into the Far Realms zone updated to 3.5.Talen Regency