what is the river that flows from germany to hungary to the black sea I believe that must be the Danube, since that is the only river with tributaries in Germany that flows into the Black Sea. Please see the link.
The Dniester River flows into the Black Sea
The black river flows north to south. The nile river is the only river in the world that flows south to north.
Danube River
The River Danube starts in Germany and flows through Austria, Hungary and Romania and empties into the Black Sea.
The Danube River empties into the Black Sea.
Danube
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The Dnieper River flows through to Red Sea
The Danube River flows into the Black Sea.
Dnieper river flows into the Black Sea
The River Thames, pronounced "Temz".