Day 9: First campaign setting I played in.

The first module I played in was "The Keep on the Borderlands," so I believe that's Greyhawk.   :)  One of my first DMs, AK, was a huge Greyhawk fan too.

I remember him going on about Furyondy and the Nyr Dyv and Iuz...  He had the maps from the Darlene set up in his room.

I don't specifically remember *where* he set his adventures and I don't remember *ever* being in an urban location, but I'm certain we were playing in Greyhawk.