Fahrt ins Blaue, 1937

"Fahrt ins Blaue" is a German phrase that literally means "trip into the blue," but idiomatically it suggests something akin to "mystery tour" or "trip to nowhere in particular." This couple took such a trip in 1937, as we can see in this amusing souvenir real photo postcard (mouse over the image to see a close-up of the imaginary plane and its smiling occupants).

Does anyone recognize the location that they're flying over?