There is a reciprocal agreement with Indiana. The area is inside the breakwall, fom the east end of the wall to the Coast Guard station, along an undrawn line. North of the wall is Indiana. It also contains the Calumet river to I believe 95th Street, but not the old U.S.Steel slip. Either license is valid in this area. Believe it or not, the end of the pier in Calumet Park is in Indiana waters. I have heard that you can have either license at the Stateline Power plant, but I'm not sure about that. I buy both licenses every year just to be safe. The money goes to a good cause.