Po Valley

The Po Valley, also called the Po Plain, Plain of the Po, or Padan Plain (Italian: Pianura Padana), is a large and important area in northern Italy. It stretches about 650 km (400 mi) from west to east and covers 46,000 km² (18,000 square miles). This flat land runs from the Alps down to the Adriatic Sea, and many people live there.

This valley is very flat and has many rivers and streams. These include the Po River and its tributaries like the Tanaro, Adda, and Oglio. The rivers come from the Alps in the north and the Apennines in the south.

Because of its rich soil, the Po Valley is a key place for farming. It is very important to Italy's economy and environment. The Po Valley is one of the most important areas in Southern Europe.

Geology

Main article: The river Po

The Po Valley is built on an old basin and deep valleys made long ago when land masses moved together. Over time, soil and rocks from the mountains filled this area. The shape of the coast near the Adriatic Sea changes because of how much soil is added and how the land moves up and down.

In 1973, people found natural gas deep underground, about 6 km (4 miles) below the surface.

Geography

The Po Valley is a big, flat area in northern Italy. It stretches about 650 kilometers from the Alps to the Adriatic Sea. The land here is mostly flat, but it has some small hills near the edges.

The valley has two main parts. The upper part is drier and less good for farming. The lower part is very fertile and great for growing crops. Many towns and cities are in this lower part, where a lot of industry is found today.

In the past, some parts of the valley were wet and swampy. Over time, people built channels and drained the water to make the land better for farming. This work began a long time ago and continued for many years. Today, the whole valley is used for farming.

Tributaries

The Po Valley has many rivers that flow into the main Po River. These smaller rivers are called tributaries. They come from different directions and help water the land around them. They are important for the environment and the people living there.

Major cities

From upstream to downstream:

Piedmont

• Paesana
• Sanfront
• Martiniana Po
• Villafranca Piemonte
• Turin
• Chivasso
• Casale Monferrato
• Valenza

Lombardy and Emilia-Romagna

• Pavia
• Piacenza
• Cremona
• Casalmaggiore
• Ferrara

Veneto

• Po Delta – where the river flows into the Adriatic Sea

Climate and vegetation

The Po Valley has a humid subtropical climate. It is surrounded by the Alps and the Apennines, and close to the Adriatic Sea. The area has a lot of relative humidity all year. Winters are cool and damp, with temperatures between 0 and 5 °C (32 and 41 °F). Fog and mist used to be common but happen less now. Summers are warm and humid, with temperatures between 22 and 25 °C (72 and 77 °F). Sometimes there are thunderstorms and hailstorms that can damage crops.

Rainfall in the Po Valley ranges from 700 to 1,200 mm (30 to 45 inches) each year, mostly in autumn and spring. Winds are usually gentle, but strong winds or storms can clear the air quickly. The area can get quite polluted in winter when cold air stays close to the ground. Originally, the land was covered with forests of pedunculate oak, poplars, European hornbeam, alders, elderberry, elms, willows, maples, ash, and other trees. Some of the last forests remain near the River Ticino and are protected.

History

Prehistory and antiquity

The Po Valley has had people living there for a very long time — since about 780,000 years ago. During cold times, called glaciations, people from Northern Europe may have used the valley as a safe place to live. When the climate was warm, the valley would fill with water, but when it got cold again, people and animals could walk through it to reach places like France and Spain.

Big cities started to appear in the Po Valley much later than in places like Greece or southern Italy. The first known people there were the Ligurians. Later, people called the Celtic Insubres came and settled in the area. After them, a group called the Etruscans arrived and brought with them new ways of building cities. They named places like Parma, Ravenna, and Bologna. But their time there didn’t last long. Eventually, other groups like the Venetics and Greeks came and changed the valley even more.

Middle Ages

As time went on, the Po Valley saw many changes. After a long period of peace called the Pax Romana, the area faced many invaders, including Attila and his Huns. Many people moved to the mountains for safety. Then came a group called the Lombards, who named the area Lombardy. They ruled the land and split it into smaller parts called duchies. Over time, their strict rules became softer.

Later, a leader named Charlemagne took over the area and made it part of a big empire. As years passed, people began to change the land more, clearing forests and draining wetlands to grow food. This helped the population grow and led to bigger towns and more trade. By the time of the Medieval Warm Period, many new farms appeared, and cities like Milan became very important.

Economy

The Po Valley is very important for farming and industry in Europe. The Po River helps make electricity, and it also waters crops in the area.

Pollution

The Po Valley has some of the worst air in Europe. Satellite images show harmful gases and tiny particles over the valley, including cities like Milan, Turin, and Bologna. Cars, factories, and farms all add to this pollution.

Many cities in the Po Valley, such as Brescia and Bergamo, have high levels of harmful tiny particles in the air. Other cities like Turin and Milan also have a lot of harmful gas from traffic. This poor air affects many people living in these areas.