* I am on a river in the Northern Hemisphere.
* It is about 1,770 miles long.
* This place has been called “blue.”
* It rises in Germany and flows into the Black Sea.
* It flows through Vienna, Budapest, and Belgrade.
* It was romanticized in music by Johann Strauss.
* If you know Dan, you probably know this place.
* It is Europe’s second longest river

Answer: The Danube River