The Breg River serves as the source of this river in Germany, which flows for 1,777 miles before emptying into the Black Sea in Romania and the Ukraine.
This body of water is home to Belene Island, which housed a concentration camp in the 20th-century for political dissidents. A popular tourist destination is viewing this river's namesake "Bend" from the Julianus Lookout from the town of Vac. Its namesake "flat" is home to the "Great Rye Island," partly because the rye crop is cultivated there. This river, which is classified as the "Seventh Corridor" is home to the huchen, a type of salmon native to this river.  A country built a namesake canal to connect this river to their (*) Tisa River. The Razim-Sinoe lagoon complex can be found south of this river's delta, which is home to the ports of Sulina and Tulcea. The Breg River serves as the source of this river in Germany, which flows for 1,777 miles before emptying into the Black Sea in Romania and the Ukraine. For 10 points, name this second-longest river in Europe.
This body of water is home to Belene Island, which housed a concentration camp in the 20th-century for political dissidents.
Danube