I had the honor of DMing a long-running campaign which we managed to stick with for several years. It all began with an adaptation of a certain commercial adventure set in the town of Saltmarsh about which very little information was provided. I changed the name to Salthaven (because who would want to live in a town called Saltmarsh?) and the place became our base for years of adventure. This is the first pen and paper map I did of the place, along with a later version traced out in Illustrator.