[Answer] 1. We start our tour in Romania, where Europe's second longest river empties in the Black Sea. Which river is this?

Step 1 : Introduction to the question "1. We start our tour in Romania, where Europe's second longest river empties in the Black Sea. Which river is this?"

...1. Volga 2. Danube 3. Dnieper 4. Dniester The Danube originates in the Black Forest region in Germany and flows to the Black Sea over a length of 2,860 km (1,780 mi). After it leaves Germany, it flows through or forms the border with Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova and Ukraine. Most of its delta lies in Romania, although the northern part is part of Ukraine. The Volga is the longest river in Europe (3,692 km/2,294 mi). It empties in the Caspian Sea. The Dnieper (2,290 km/1,420 mi) and Dniester (1,362 km/846 mi) are two other rivers that empty in the Black Sea.

Step 2 : Answer to the question "1. We start our tour in Romania, where Europe's second longest river empties in the Black Sea. Which river is this?"

Danube:

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