Quote Originally Posted by Zolkabro View Post
Actually, I would definitely prefer to do the geography first, because it is hard to work out the history and culture of countries that don't exist yet.
That's one reason I've used the World of Greyhawk for my campaign setting of choice, for all of my online games (save for one set in Hades) since 1995. I can utilize the maps, history, climate, politics, religion, and sites of interest as a springboard. Mind you, not a lot has been written about the undersea realms, which is just as I like it.

Granted the Sinking Isle, Turucambi Reef, and Jungle of Lost ships are all canon Greyhawk references - but I put my own unique spin on them all.