Chicago river, being one of the smaller rivers around flows right through the city of Chicago even reaching downtown. there being different spots where you can just rest and goof off around, often people setting picnics up around the riverside and on the days that its not an exceptionally fast flow you can find people swimming on the riverside. Its a beautiful river to view and many different fish flow through this river, often you being able to feed the fish and all over the few bridges placed throughout the city across the river. Chicago river is another thing people like to just sit around and look at and really it can be quite fun for a nice swimming day.