Which Italian valley is a noted European tornado hotspot?

The Italian valley noted as a European tornado hotspot is the Po Valley.

Also called the Pianura Padana, the Po Valley stretches across northern Italy between the Alps and the Apennines. Its broad, relatively flat terrain and position between major mountain ranges help create conditions favorable for severe thunderstorms. Warm, humid air can meet colder air moving southward, producing instability and strong wind shear.

Tornadoes are not equally common throughout the valley. Historical climatology identifies the eastern Po Plain as especially active, although tornado reports vary with population density, observation practices, and the strength of individual storms. The region’s activity is notable in a European context, but it is not equivalent to the much larger and more frequently discussed tornado regions of the central United States.

A common mix-up is confusing the Po Valley with Italy’s Arno, Tiber, or Aosta valleys. Those are real geographic regions, but the Po Valley is the one routinely singled out in tornado-climatology summaries.