The Po (/poʊ/ POH, Italian: [ˈpɔ]; Latin: Padus or Ēridanus; Ancient Greek: Πάδος, romanized: Pádos, or Ἠριδανός, Ēridanós; Ancient Ligurian: Bodincus or Bodencus) is the longest river in Italy. It is a river that flows eastward across northern Italy starting from the Cottian Alps. The Po flows either 652 km (405 mi) or 682 km (424 mi) – considering the length of the Maira, a right bank tributary.