This map was created using Campaign Cartographer 2 a long time ago. It’s based off of the map used in the Lankhmar: City of Adventure sourcebook by TSR, and of course The Map of Nehwon by Jim Cawthorne.
Campaign Cartographer file: NehwonMap.ZIP
The CC2 format allows you to zoom and print to scale.
Free Viewer Download: CC2 Viewer