Which is longer, The Tiber or Cremera?
Tiber: The Tiber ( , Latin "Tiberis", Italian "", ] ) is the third-longest river in Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing 406 km through Tuscany, Umbria and Lazio, where it is joined by the river Aniene, to the Tyrrhenian Sea, between Ostia and Fiumicino.
i don't know