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Nowadays it corresponds with the province of Rovigo in the viewpoint of political geography. In the viewpoint of physical geography it is a strip of land about 100-km long and 18-km wide located between the lower courses of the Adige and the Po River rivers, limited to the east by the Adriatic Sea and leaving the western limit undefined.
The Po and the Adige are the first and the third biggest rivers of Italy as for rate of flow, yet another river flows across Polesine between these two main rivers: the Canal Bianco; this means that by far most of the fresh water of Italy flows into the sea through Polesine. Due to this large amount of water it has to deal with, it has many for drainage.
The biggest city is Rovigo (51,000 inhabitants), followed by Adria (20,000 people). Other important centres are Porto Viro, Lendinara, Porto Tolle, Badia Polesine, Occhiobello and Taglio di Po. Important agricultural centres are Arquà Polesine, Loreo, Polesella and Lusia.
The Greeks founded Adria in the 12th -11th century BC on a former channel of the Po (nowadays it is the lower course of the Canal Bianco river); the channel was given the name Adria and the sea was given the name Adriatic after the colony name. The channel Adria was then recognized to be the lower course of the Mincio river, that was flowing into the Adriatic sea in ancient times.
Etruscans and Adriatic Veneti inhabited the area during the 6th and 5th centuries BC, then it was conquered by the Romans. Etruscans and Romans decontaminated the area by digging canals for drainage.
Some historiansfor instance: think that the battle of the Raudine Plain of 101 BC could have been fought in this area.
In 1152, another disaster changed the hydrography of Polesine: a breach opened in the banks of the Po at Ficarolo and the new main course started flowing much closer to the Adige. The rulers of the whole area (except for the new delta of the Po) were the Este; the area was formerly named County of Gavello, but two centuries after the disaster and due to the decline of the Abbey of Gavello it started being named County of Rovigo.
In 1484, after the end of the War of Ferrara, the Republic of Venice took possession of the area north of the Tartaro-Canalbianco, named "Polesine of Rovigo" by the Este because of its characteristic of being an island between rivers; other lands outside the proper named "Polesine of Rovigo" were also annexed, including the areas of Adria, Polesella and Guarda Veneta. All these areas established the Territory of Polesine inside the Domini di Terraferma (Mainland State) of the Republic of Venice.
The Este claimed again the possession of the whole Polesine during the war of the League of Cambrai, but after a short occupation in 1508-1511 the frontiers were back to those of 1484.
Between 1602 and 1604, an agreement between the Republic of Venice and the Papal States that then ruled over the southern part of the Po delta allowed the digging of a new final course for the Po known as the "cutting of Porto Viro"; the toponym Taglio di Po means exactly "cutting of Po" and refers to this event, that has been the last change in the main course of the river until today.
First origins goes up to the Pliocene epoch. Contemporary to the rising of Alps and Apennine Mountains, the entire Padania was filled by a long inlet (the Adriatic depression) and the seabed of this huge ditch was full of troughs and .
At the end of the last glaciation (10.000 years ago), most of Padania actual territory was just formed. Landscape's last mutation was due to the raising of the sea level and the .
In 1604, river Po's natural course was artificially modified and after this work actual delta was formed. Floods frequently happened in Polesine filled the depressions of the area with several bundles of sediments consisting in sand, clay and silt.
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