The Tiber is a river. The phrase makes perfect sense, so no, it's not an idiom. Someone is swimming across the Tiber river.
The Tiber River
He dares him to swim in the Tiber River. He says: The troubled Tiber chafing with her shores, Caesar said to me 'Darest thou, Cassius, now Leap in with me into this angry flood, And swim to yonder point?' Upon the word, Accoutred as I was, I plunged in And bade him follow;
the kind that swim with sharks
Caesar is not able to swim accross the Tiber river and cassius can
The Tiber River runs through rome &:-}---------
The city of Rome was built on the banks of the Tiber River.
Tiber River
I'm not sure about this answer, so you should do the research. The answer is the Tiber River.
Rome is the capital of Italy and is nicknamed the Eternal City. It runs through the eastern banks of the river Tiber.
The Tiber river river valley!
The Tiber River
Encounter with Tiber was created in 1996.