Re: Greyhawk question
New Jersey, New York, and Pennsylvania had the Keoland area back when Living Greyhawk was running. At the time I primarily played in Nyrond, or "core" areas like the Bright Lands, although I don't know that I could necessarily answer such an exacting question about rivers in Nyrond either.
I did some Google searches and it looks like you might be asking about the town of Keaton?