Bis dahin wird viel Wasser ins Meer fließen.

Hungarian Translation

Sok víz lefolyik még addig a Dunán.

No mention of Danube in the German sentence.
Until then a lot of water will flow…
…into the sea (German)
…into the Danube (Hungarian)

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Probably this is generally a very local thing.
In the lower Rhine valley in Germany, where I grew up, the saying is:

“Da muss noch viel Wasser den Rhein runter fließen.”

Any other local varieties?