The Danube is the second-longest river in Europe, after the Volga in Russia.
It flows through much of Central and Southeastern Europe, from the Black Forest south into the Black Sea.
A large and historically important river, it was once a frontier of the Roman Empire.
Russian drones targeted Ukraine's southern Odesa region on a Sunday morning, including a Danube port on the border with NATO member Romania
Reni and Izmail Ports have been repeatedly attacked by Russian drones in recent weeks.
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