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Thanks :)
This small tunnel is located on the Adriatic coastal road in Croatia. Somewhere close to a small place called Prizna, where you have a ferry to the island Pag.

Hmmm, haven't been there. I took the E65 all the way down to Split when I was in Croatia. Thanks for the infos :)

That's the same road. Either you joined it after this, or you slept through that part :)