Editing Geography of Italy (section)

===Plains===
[[File:Marmilla las plassas.jpg|thumb|Plain of [[Campidano]]]]
The plains make up 23.2% of the Italian national territory. In between the two lies a [[Po Valley|large plain]] in the valley of the [[Po River|Po]], the largest river in Italy, which flows {{convert|652|km|mi|0|abbr=on}} eastward from the [[Cottian Alps]] to the Adriatic. The Po Valley is the largest plain in Italy, with {{convert|46,000|km2|abbr=on}}, and it represents over 70% of the total plain area in the country.<ref name=eug92 /> The Po Valley is divided into two bands:<ref name=Colli /> the high plain, which borders the Alpine and Apennine hills, and the low plain located in the center and extended up to the Po delta.

In the peninsular part and in the islands there are only small plains often located along the coasts and at the mouth of the major rivers, near which they formed:<ref name=Colli /> this is the case, for example, of the [[Tavoliere delle Puglie]], of the [[Campidano]] in Sardinia or the [[Maremma]] in Tuscany.<ref name=Colli />

The Italian plains have different origins:

* Most of it is of alluvial origin, that is, formed by the debris deposited by the rivers along their course. The Po Valley, [[Valdarno]], [[Pontine Marshes]], Campidano, [[Metapontino]], [[Plain of Sele]], [[Salento]], [[Plain of Sibari]], [[Plain of Catania]] and [[Plain of Sant'Eufemia]] are alluvial.<ref name=Pianure>{{cite book|first=Gianfranco|last=Bresich|title=Iperlibro|publisher=Deagostini|year=2005|isbn=88-418-2169-8|page=253|language=it}}</ref> 
* The second largest Italian plain is the Tavoliere delle Puglie,<ref name=Pianure /> which is a rising plain, formed from the raising of the seabed.
* Other plains, for example the [[Plain of Campania]], are of volcanic origin<ref name=Pianure /> where the ashes of the volcanoes have filled the surrounding valleys, transforming them into fertile plains.