Po (river)

The **Po** (Latin: _Padus_, , ancient "Eridanus") is a river that flows 652 kilometers (405 miles) eastward across northern Italy, from Monviso (in the Cottian Alps) to the Adriatic Sea near Venice. It has a drainage area of 71,000 km² and is the longest river in Italy. It is the longest river in Italy. It flows through 5 cities: Turin, Piacenza, Cremona, and Ferrara.

## Background

It goes through many important Italian towns, including Turin (Torino) and (indirectly) Milan (Milano), in Lombardy. It is connected to Milan through a net of channels called _navigli_, which Leonardo da Vinci helped design. Near the end of its course, it creates a wide delta (with hundreds of small channels and five main ones, called _Po di Maestra_, _Po della Pila_, _Po delle Tolle_, _Po di Gnocca_ and _Po di Goro_) at the southern part of which is Comacchio, an area famous for eels. The Po valley corresponds to the Roman Cisalpine Gaul, divided in Cispadane Gaul (South of the Po) and Transpadane Gaul (North of the Po).

The vast valley around the Po is called _Pianura Padana_ and is so efficiently connected by the river that the whole valley became the main industrial area of the country.  This river is subject to the authority of a special authority, the _Magistrato delle Acque_.

Roman poets sometimes referred to the Po river as Eridanus, which also has other meanings.

The main products of the farms around the river are cereals.

In 2005, water from the Po was found to contain "staggering" amounts of benzoylecgonine, which is excreted by cocaine users in urine.  Based on these figures, cocaine consumption was estimated to be about 4 kg daily, or 27 doses per day per thousand young adults in areas that feed into the river—a number nearly three times higher than previous estimates.http://news.bbc.co.uk/1/hi/world/europe/4746787.stm

## Drying up

On 4 May 2007, the river dried up in spots completely. Italy declared a state of emergency in the northern and central regions. The Alps had reduced snowfall the previous winter. It was the Alps's warmest winter in 1300 years. Experts said this could have been part of global warming.  There was some discussion about filling the river up by diverting water flows from large lakes and reservoirs in the Alps.

The Po showed the effects of drought again in 2017.  By then, experts were even surer it was part of global warming, then called climate change.

## Tributaries

Tributaries include (R from the right side, L from the left, looking downstream):
- Pellice (L)
- Varaita (R)
- Maira (R)
- Dora Riparia (L)
- Stura di Lanzo (L)
- Orco (L)
- Dora Baltea (L)
- Sesia (L)
- Tanaro (R)
- Scrivia (R)
- Agogna (L)
- Ticino (L)
- Lambro (L)
- Trebbia (R)
- Nure (R)
- Adda (L)
- Arda (R)
- Taro (R)
- Parma (R)
- Enza (R)
- Oglio (L)
- Mincio (L)
- Secchia (R)
- Panaro (R)

## More reading

- Saltini Antonio, _Dove l'uomo separò la terra dalle acque. Storia delle bonifiche in Emilia Romagna_, Diabasis, Reggio Emilia 2004

## Infobox (_river)

- **name**: Po
- **image**: LocationPoRiver.PNG
- **image caption**: The Po river
- **source1 location**: Cottian Alps, Italy
- **mouth**: Adriatic Sea
- **subdivision type1**: Country
- **subdivision name1**: Italy
- **discharge1 avg**: 1540 m³/s