This postcard was a total surprise for me, because I received it from a postcrosser from texas that I've already swapped with :) I just didn't expect another postcard :) The writting "Lake Superior" on this card is quite big, so i couldn't have a doubt that it was a lake, but it looks like a sea :)
Lake Superior is the largest of the five Great Lakes of North America. It is bounded to the north by Ontario, Canada and Minnesota, United States, and to the south by the U.S. states of Wisconsin and Michigan. It is the largest freshwater lake in the world by surface area and is the world's third-largest freshwater lake by volume.
Thank you very much, Shirley! :)