Can you expand a bit. What do you mean by "what is a lake or what is a big city"?
Thanks for the comment.
Thanks for the comment.
BTW: You have Heligoland[1] as a reachable destination. I don't think that's actually true, those are real high sea ferries for which, AFAIK, the 49 Euro ticket is not valid. :)
Nice catch on Heligoland. Thanks. The final journey is via Schiff and I had not filtered that out. However, I don't know if DB categorizes Schiff that are included or excluded from the 49 Euro ticket.