High Quality Content by WIKIPEDIA articles! The Po Valley, Po Plain, Plain of the Po, or Padan Plain (Italian: Pianura Padana or Val Padana) is a major geographical feature of Italy. It extends approximately 650 km (400 mi) in an east-west direction, including its Venetic extension not actually related to the Po river; it runs from the Western Alps to the Adriatic Sea. The flatlands of Veneto and Friuli are often considered apart since they do not drain into the Po, but they effectively combine into an unbroken plain. The plain has a geologic basis. It represents the surface of an in-filled system of ancient canyons (the 'Appennine Foredeep') extending from the Appennines in the south to the Alps in the north, including the northern Adriatic. In addition to the Po and its affluents the contemporary surface includes the Savio, Lamone and Reno to the south, the Adige, Brenta, Piave and Tagliamento to the north, among the many streams that empty into the north Adriatic from the west and north