Then we went over water again for about an hour and I was confused. The Atlantic was behind us?
Turns out we flew over the great lakes, which took an hour at circa 500 mph.
Mind blown.
Then I went to Chicago and they have a beach. With an ocean. Looks exactly like a normal beach. Except it's a lake! Fresh water beach blew my tiny mind again.
The largest lake I'd seen before that was in the lake district (imaginatively named) in England. They were big, to me. But they were not horizon to horizon like Lake Michigan was.