Answer
Italy has many plains, mostly along the coasts and mostly small in size. The largest plain in Italy is the Po Valley, which extends between the Alps and the Apennines and is formed by the Po River and its tributaries. In central Italy, most of the plains are the result of extensive reclamation work on alluvial plains made marshy by the presence of coastal dunes, such as the Maremma, the Pontine Marshes, and the Roman Campagna. In the south, the main plains are the Apulian plains, of tectonic origin, such as the Tavoliere delle Puglie and the Murge Plateau. In the south, there are also two volcanic plains, not very extensive but particularly fertile: the Campanian Plain, at the foot of Mount Vesuvius, and the Catania Plain, at the foot of Mount Etna.