Crewed by volunteers wearing Roman tunics, the expedition is part of a European Union-funded project to raise awareness of the region's Roman past.

Based on the remains of Roman shipwrecks discovered in the German town of Mainz, the Friedrich-Alexander University rebuilt a fourth-century Roman Danube ship made of oak.

"Living Danube Limes" is a transnational project with 10 Danube countries co-operating to make the former Roman "Limes" - the frontier line of the Roman Empire that takes its name from the Latin word for boundary - a new common cultural bond in Central and South-Eastern Europe.

(Reporting by Krisztina Fenyo; Editing by Alex Richardson)