u/Bagns

So I'm currently running a game that has the party stationed in a megacity of an area, its supposed to be bigger than a metropolis and I'd like to have a physical reference for not only the party to get an idea of where they're going, and also for me to best show what I describe

I know that I'd likely be forgoing great detail on things but that's something I'm find to sacrifice, but what would be the best way to make a map like that?