The Po (/poʊ/; Latin: Padus and Eridanus; Italian: Po [pɔ*]; ancient Ligurian: Bodincus or Bodencus; Ancient Greek: Πάδος and Ἠριδανός) is a river that flows either 652 km (405 mi) or 682 km (424 mi) – considering the length of the Maira, a right bank tributary – eastward across northern Italy, from a spring seeping from a stony hillside at Pian del Re, a flat place at the head of the Val Po under the northwest face of Monviso (in the Cottian Alps) through a delta projecting into the Adriatic Sea near Venice.