Trebbia trĕb´byä [key], river, c.70 mi (110 km) long, rising in the Ligurian Apennines, N Italy, and flowing generally NE past Bobbio to join the Po River near Piacenza. Near that city in 218 BC Hannibal won a decisive victory over the Romans. In 1799 the Trebbia was the scene of a Russo-Austrian victory over the French.
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