Lake Michigan
Ocean*
I mean, Lake Michigan is big enough to be a sea. All the Great Lakes are, they’re not considered seas because they’re not all at sea level, they’re all freshwater, and they’re not directly connected to the ocean (they’re only connected through rivers and lochs)
Small lakes don’t have noticeable waves but because the Great Lakes are so big there’s enough room for the air to downdraft across it (which is also why in Michigan you get lake effect weather and so it can be a blizzard one day and 70° the next)
