Po Valley
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The Po Valley, Po Plain, Plain of the Po, or Padan Plain (, , or ) is a major geographical feature of
northern Italy Northern Italy (, , ) is a geographical and cultural region in the northern part of Italy. The Italian National Institute of Statistics defines the region as encompassing the four Northwest Italy, northwestern Regions of Italy, regions of Piedmo ...
. It extends approximately in an east-west direction, with an area of including its Venetic extension not actually related to the Po basin; it runs from the Western
Alps The Alps () are some of the highest and most extensive mountain ranges in Europe, stretching approximately across eight Alpine countries (from west to east): Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria and Slovenia. ...
to the
Adriatic Sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Se ...
. The flatlands of
Veneto Veneto, officially the Region of Veneto, is one of the 20 regions of Italy, located in the Northeast Italy, north-east of the country. It is the fourth most populous region in Italy, with a population of 4,851,851 as of 2025. Venice is t ...
and
Friuli Friuli (; ; or ; ; ) is a historical region of northeast Italy. The region is marked by its separate regional and ethnic identity predominantly tied to the Friulians, who speak the Friulian language. It comprises the major part of the autono ...
are often considered apart since they do not drain into the Po, but they effectively combine into an unbroken plain, making it the largest in
Southern Europe Southern Europe is also known as Mediterranean Europe, as its geography is marked by the Mediterranean Sea. Definitions of southern Europe include some or all of these countries and regions: Albania, Andorra, Bosnia and Herzegovina, Bulgaria, C ...
. It has a population of 17 million, or a third of Italy's total population. The plain is the surface of an in-filled system of ancient canyons (the "Apennine Foredeep") extending from the
Apennines The Apennines or Apennine Mountains ( ; or Ἀπέννινον ὄρος; or – a singular with plural meaning; )Latin ''Apenninus'' (Greek or ) has the form of an adjective, which would be segmented ''Apenn-inus'', often used with nouns s ...
in the south to the Alps in the north, including the northern Adriatic. In addition to the Po and its affluents, the contemporary surface may be considered to include the Savio, Lamone and Reno to the south, and the
Adige The Adige is the second-longest river in Italy, after the Po. It rises near the Reschen Pass in the Vinschgau in the province of South Tyrol, near the Italian border with Austria and Switzerland, and flows through most of northeastern Italy ...
, Brenta, Piave and Tagliamento of the Venetian Plain to the north, among the many streams that empty into the north Adriatic from the west and north. Geo-political definitions of the valley depend on the defining authority. The Po Basin Water Board (''Autorità di bacino del fiume Po''), authorized in 1989 by Law no. 183/89 to oversee "protection of lands, water rehabilitation, the use and management of hydro resources for the national economic and social development, and protection of related environment" within the Po basin, has authority in several administrative regions of north Italy, including the plain north of the Adriatic and the territory south of the lower Po, as shown in the regional depiction included with this article. The law defines the Po basin as "the territory from which rainwater or snow and glacier melt flows on the surface, gathers in streams of water either directly or via tributaries...". The United Nations Environment Program includes the Alps and Apennines as far as the sources of the tributaries of the Po but excludes Veneto and that portion of Emilia-Romagna south of the lower Po; that is, it includes the region drained by the Po but only the Po and its tributaries. The altitude of the valley through which the Po flows, exclusive of its tributaries, varies from approximately below sea level in the Polesine subregion (the
delta Delta commonly refers to: * Delta (letter) (Δ or δ), the fourth letter of the Greek alphabet * D (NATO phonetic alphabet: "Delta"), the fourth letter in the Latin alphabet * River delta, at a river mouth * Delta Air Lines, a major US carrier ...
around
Ferrara Ferrara (; ; ) is a city and ''comune'' (municipality) in Emilia-Romagna, Northern Italy, capital of the province of Ferrara. it had 132,009 inhabitants. It is situated northeast of Bologna, on the Po di Volano, a branch channel of the main ...
) to about at the river's origin in the southern
Piedmont Piedmont ( ; ; ) is one of the 20 regions of Italy, located in the northwest Italy, Northwest of the country. It borders the Liguria region to the south, the Lombardy and Emilia-Romagna regions to the east, and the Aosta Valley region to the ...
ese
province of Cuneo The province of Cuneo (; ) is a province in the Piedmont region of Italy. To the west, it borders the French region of Provence-Alpes-Côte d'Azur ( departments of Alpes-Maritimes, Alpes-de-Haute-Provence and Hautes-Alpes), to the north the ...
, also known as the ''Provincia granda''. The valley is crossed by a number of affluents running down from the Alps in the north and from the Apennines in the south. The Po's major affluents include the Tanaro,
Scrivia The Scrivia, long, is a right tributary of the river Po (river), Po, in northern Italy. It runs through Liguria, Piedmont, and Lombardy. Main tributaries * left bank, left hand: ** torrente Laccio; ** torrente Busalletta; ** torrente Traversa; ...
, Trebbia, Panaro and Secchia in the south, Dora Riparia, Dora Baltea, Sesia,
Ticino Ticino ( ), sometimes Tessin (), officially the Republic and Canton of Ticino or less formally the Canton of Ticino, is one of the Canton of Switzerland, 26 cantons forming the Switzerland, Swiss Confederation. It is composed of eight districts ...
(draining
Lake Maggiore Lake Maggiore (, ; ; ; ; literally 'greater lake') or Verbano (; ) is a large lake located on the south side of the Alps. It is the second largest lake in Italy and the largest in southern Switzerland. The lake and its shoreline are divided be ...
), Lambro, Adda (draining Lake Como), Oglio (draining Lake Iseo) and Mincio (draining
Lake Garda Lake Garda (, , or , ; ; ) is the largest lake in Italy. It is a popular holiday location in northern Italy, between Brescia and Milan to the west, and Verona and Venice to the east. The lake cuts into the edge of the Eastern Alps, Italian Alp ...
and called Sarca in its upper reaches) in the north.


Geology

The Po Valley and the Adriatic overlay a
foreland basin A foreland basin is a structural basin that develops adjacent and parallel to a mountain belt. Foreland basins form because the immense mass created by crustal thickening associated with the evolution of a mountain belt causes the lithospher ...
and a system of deeply buried ancient canyons surviving from the
tectonic Tectonics ( via Latin ) are the processes that result in the structure and properties of the Earth's crust and its evolution through time. The field of ''planetary tectonics'' extends the concept to other planets and moons. These processes ...
collision of an offshore land mass, Tyrrhenis, with the mainland, an incident within the collision of the African and Eurasian plates. Since the
Messinian The Messinian is in the geologic timescale the last age or uppermost stage of the Miocene. It spans the time between 7.246 ± 0.005 Ma and 5.333 ± 0.005 Ma (million years ago). It follows the Tortonian and is followed by the Zanclean, the fir ...
(7–5 mya) the system has been filling with sediment mainly from the older
Apennines The Apennines or Apennine Mountains ( ; or Ἀπέννινον ὄρος; or – a singular with plural meaning; )Latin ''Apenninus'' (Greek or ) has the form of an adjective, which would be segmented ''Apenn-inus'', often used with nouns s ...
but also from the Alps. The shoreline of the Adriatic depends on a balance between the sedimentation rate and isostatic factors. Until about 1950, the Po delta was prograding into the Adriatic. After that time due to human alteration of geologic factors, such as the sedimentation rate, the delta has been degrading and the coastline subsiding, resulting in ongoing contemporaneous crises in the city of
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
. The Malossa gas condensate field was discovered in 1973 and produces at depths of from the Upper
Triassic The Triassic ( ; sometimes symbolized 🝈) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is t ...
Dolomia Principale dolomite and the Lower
Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...
Zandobbio dolomite, capped by the Lower
Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...
Marne di Bruntino
marl Marl is an earthy material rich in carbonate minerals, Clay minerals, clays, and silt. When Lithification, hardened into rock, this becomes marlstone. It is formed in marine or freshwater environments, often through the activities of algae. M ...
.


Geography

The Po Valley is often regarded as a syncline, or dip in the crust due to compression at the edges. Regardless of whether this concept accurately describes its geology, the valley is manifestly a sediment-filled trough, or virtual syncline, continuous with the deeps of the
Adriatic Sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Se ...
. The surface terrain is therefore divided into two overall types of
landform A landform is a land feature on the solid surface of the Earth or other planetary body. They may be natural or may be anthropogenic (caused or influenced by human activity). Landforms together make up a given terrain, and their arrangement ...
: the plain, or flat surface of the fill, and the
anticline In structural geology, an anticline is a type of Fold (geology), fold that is an arch-like shape and has its oldest Bed (geology), beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex curve, c ...
at the edges, taking the form of hilly country in which the
outcrop An outcrop or rocky outcrop is a visible exposure of bedrock or ancient superficial deposits on the surface of the Earth and other terrestrial planets. Features Outcrops do not cover the majority of the Earth's land surface because in most p ...
s of the original rock are visible along with
alluvial fan An alluvial fan is an accumulation of sediments that fans outwards from a concentrated source of sediments, such as a narrow canyon emerging from an escarpment. They are characteristic of mountainous terrain in arid to Semi-arid climate, semiar ...
s formed from the outwash of the more severe anticlinal terrain; that is, the Apennines and the Alps. The valley is broadly divided into an upper, drier part, often not particularly suited for agriculture, and a lower, very fertile, and well-irrigated section, known in
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
and western Emilia as ''la Bassa'', 'the low (plain)'. The upper areas of the Po valley take local names which reflect in their meanings their being modestly suited for farming. So we have the Piedmontese ''vaude'' and ''baragge'', the Lombard ''brughiere'' and ''Groane'', or, exiting from the Po valley proper, the
Friuli Friuli (; ; or ; ; ) is a historical region of northeast Italy. The region is marked by its separate regional and ethnic identity predominantly tied to the Friulians, who speak the Friulian language. It comprises the major part of the autono ...
an ''magredi'', areas remote from easily reachable water tables and covered with dense woods or dry soils. This specific meaning for 'lower plain' derive from a geologic feature called the ''fontanili'' line or zone, a band of springs around the Val Po, heaviest on the north, on the lowermost slopes of the anticline. It varies from a few kilometres to as much as wide. The fontanili line is the outcrop, or intersection, of the anticline's
water table The water table is the upper surface of the phreatic zone or zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with groundwater, which may be fresh, saline, or brackish, depending on the loc ...
with the surface at the edge of the ''bassa''. The rock above the line is porous. Surface water in the intermittent streams of the mountains tends to disappear below ground only to spring out again in the spring zone. The spring zone is often called "the middle valley."
Surface runoff Surface runoff (also known as overland flow or terrestrial runoff) is the unconfined flow of water over the ground surface, in contrast to ''channel runoff'' (or ''stream flow''). It occurs when excess rainwater, stormwater, meltwater, or other ...
water (the Po and its affluents) is not of much value to the valley's dense population for drinking and other immediate uses, being unreliable, often destructive, and heavily polluted by sewage and fertilizers. Its main anthropic value is for hydro-electric power, irrigation, and industrial transport. The cost of purifying it for human consumption makes that process less feasible. The fresh drinking water comes from hundreds of thousands of wells concentrated especially in the fontanili zone. The major settlements, therefore, are also in that zone, which has become the centre of economic development and industry in Italy, and now is an almost continuous
megalopolis A megalopolis () or a supercity, also called a megaregion, is a group of metropolitan areas which are perceived as a continuous urban area through common systems of transport, economy, resources, ecology, and so on. They are integrated enough ...
stretching from
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
to
Trieste Trieste ( , ; ) is a city and seaport in northeastern Italy. It is the capital and largest city of the Regions of Italy#Autonomous regions with special statute, autonomous region of Friuli-Venezia Giulia, as well as of the Province of Trieste, ...
. The ''bassa Padana'' was settled and farmed earliest, in Etruscan and Roman times. After the collapse of the
Roman Empire The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...
(5th century AD), lack of maintenance of the irrigation systems associated with a cooling climate phase (i.e. the so-called Migration Period or The Dark Age Cold Period) led to the progressive waterlogging of the Po Valley and the natural depressions on the right side of the Po turned in vast swamp basins. The waterlogging process of the area continued until the 10th-century influencing the human sustenance and settling practices. According to historical-archaeological data, indeed, the
wetland A wetland is a distinct semi-aquatic ecosystem whose groundcovers are flooded or saturated in water, either permanently, for years or decades, or only seasonally. Flooding results in oxygen-poor ( anoxic) processes taking place, especially ...
s were exploited for fishing as well as for transport by boat while the
early medieval The Early Middle Ages (or early medieval period), sometimes controversially referred to as the Dark Ages, is typically regarded by historians as lasting from the late 5th to the 10th century. They marked the start of the Middle Ages of Europ ...
sites settled on the fluvial ridges, in topographically higher and strategic position in the surrounding swampy meadows. The Po Valley has been completely turned to agriculture since the
Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the 5th to the late 15th centuries, similarly to the post-classical period of global history. It began with the fall of the Western Roman Empire and ...
, when efforts from monastic orders, feudal lords and free communes converged. The older and smaller cities deriving from ancient times are still located there. According to historical maps and documents the land reclamation of the Po Valley reached its peak during the
Renaissance The Renaissance ( , ) is a Periodization, period of history and a European cultural movement covering the 15th and 16th centuries. It marked the transition from the Middle Ages to modernity and was characterized by an effort to revive and sur ...
(15th–16th centuries) and continued in the Modern Age (17th–18th centuries), with the last marsh areas only being reclaimed in the 20th century: channels and drainage system are still active and allow the Po Valley to be drained and be cultivatable.


Tributaries


Major cities

From upstream to downstream:


Piedmont

* Paesana * Sanfront * Martiniana Po * Villafranca Piemonte *
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
*
Chivasso Chivasso (; ) is a communes of Italy, comune in the Metropolitan City of Turin, in the Italy, Italian region of Piedmont, located about northeast of Turin. Chivasso has a population of about 27,000. It is situated on the :wikt:left bank, left bank ...
*
Casale Monferrato Casale Monferrato () is a town in the Piedmont region of Northwest Italy, northwestern Italy, in the province of Alessandria. It is situated about east of Turin on the right bank of the Po River, Po, where the river runs at the foot of the Montfe ...
* Valenza


Lombardy and Emilia-Romagna

*
Pavia Pavia ( , ; ; ; ; ) is a town and comune of south-western Lombardy, in Northern Italy, south of Milan on the lower Ticino (river), Ticino near its confluence with the Po (river), Po. It has a population of c. 73,086. The city was a major polit ...
*
Piacenza Piacenza (; ; ) is a city and (municipality) in the Emilia-Romagna region of Northern Italy, and the capital of the province of Piacenza, eponymous province. As of 2022, Piacenza is the ninth largest city in the region by population, with more ...
*
Cremona Cremona ( , , ; ; ) is a city and (municipality) in northern Italy, situated in Lombardy, on the left bank of the Po (river), Po river in the middle of the Po Valley. It is the capital of the province of Cremona and the seat of the local city a ...
* Casalmaggiore *
Ferrara Ferrara (; ; ) is a city and ''comune'' (municipality) in Emilia-Romagna, Northern Italy, capital of the province of Ferrara. it had 132,009 inhabitants. It is situated northeast of Bologna, on the Po di Volano, a branch channel of the main ...


Veneto

* Po Delta – where the river flows into the
Adriatic Sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Se ...


Climate and vegetation

The Po Valley has a generally humid subtropical (Köppen: ''Cfa'') climate. The conformation of the plain, surrounded by the
Alps The Alps () are some of the highest and most extensive mountain ranges in Europe, stretching approximately across eight Alpine countries (from west to east): Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria and Slovenia. ...
and the
Apennines The Apennines or Apennine Mountains ( ; or Ἀπέννινον ὄρος; or – a singular with plural meaning; )Latin ''Apenninus'' (Greek or ) has the form of an adjective, which would be segmented ''Apenn-inus'', often used with nouns s ...
, and the influence of the
Adriatic Sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Se ...
cause high levels of
relative humidity Humidity is the concentration of water vapor present in the air. Water vapor, the gaseous state of water, is generally invisible to the human eye. Humidity indicates the likelihood for precipitation (meteorology), precipitation, dew, or fog t ...
throughout the year. The climate is increasingly warmer and more humid farther south and east. Winters are cool and damp, with January mean temperatures ranging between . Fog and
mist Mist is a phenomenon caused by small droplets of water suspended in the cold air, usually by condensation. Physically, it is an example of a Dispersion (chemistry), dispersion. It is most commonly seen where water vapor in warm, moist air meets ...
are frequent, although the urban heat effect has made winters less foggy and cold than before in some areas. Snow and winter droughts can deny sufficient moisture to the soil for agriculture. Summers are hot and humid, with July mean temperatures ranging between (1971–2000 averages). Frequent thunderstorms and sudden
hail Hail is a form of solid Precipitation (meteorology), precipitation. It is distinct from ice pellets (American English "sleet"), though the two are often confused. It consists of balls or irregular lumps of ice, each of which is called a hailsto ...
storms can produce large hail, dump large quantities of rain, and destroy crops.
Supercell A supercell is a thunderstorm characterized by the presence of a mesocyclone, a deep, persistently rotating updraft. Due to this, these storms are sometimes referred to as rotating thunderstorms. Of the four classifications of thunderstorms (su ...
thunderstorms produce large hail, with significant agricultural costs.
Tornado A tornado is a violently rotating column of air that is in contact with the surface of Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. It is often referred to as a twister, whirlwind or cyclone, although the ...
es are common in the plains of the valley. The
Friuli-Venezia Giulia Friuli-Venezia Giulia () is one of the 20 regions of Italy and one of five autonomous regions with special statute. The regional capital is Trieste on the Gulf of Trieste, a bay of the Adriatic Sea. Friuli-Venezia Giulia has an area of and a ...
, beyond the Po plain itself, is downwind of the mountains and upwind of moisture sources from nearby is an exception. Spring and autumn are well-marked and pleasant. Both winter and summer are less mild in the lower parts along the Po, while the
Adriatic Sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Se ...
and the great lakes moderate the local climate in their proximity.
Rainfall Rain is a form of precipitation where water droplets that have condensed from atmospheric water vapor fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Earth. ...
varies between and equally distributed during the year. Rainfall maximums are during autumn and spring. Winds are usually weak, although sudden bursts of foehn or thunderstorms can sweep the air clean. The almost enclosed nature of the Padan basin with much road traffic, makes it prone to a high level of pollution in winter, when cold air clings to the soil. The natural potential vegetation of the Po basin is a mixed broadleaf forest of pedunculate oak, poplars, European hornbeam, alders,
elderberry ''Sambucus'' is a genus of between 20 and 30 species of flowering plants in the family Adoxaceae. The various species are commonly referred to as elder, with the flowers as elderflower, and the fruit as elderberry. Description Elders are most ...
, elms, willows, maples, ash, and other central-European trees. The largest remaining fragments of forest are located around the River Ticino and are protected by a Biosphere Reserve.


History


Prehistory and antiquity

The Po Valley has had traces of inhabitation since at least 780,000 years ago, when the first big glaciation of pleistocene took place. Sites such as Monte Poggiolo may have served as refuges of human populations fleeing the terribly cold conditions of
Northern Europe The northern region of Europe has several definitions. A restrictive definition may describe northern Europe as being roughly north of the southern coast of the Baltic Sea, which is about 54th parallel north, 54°N, or may be based on other ge ...
during the subsequent glaciations along pleistocene. The valley was covered by sea level in warm times, but glaciations could cause a lower sea level that allowed big mammals and humans to migrate from Africa and the Middle East to central and Western Europe through an empty and open Po valley, avoiding the barrier of the Alps, reaching the Loire Valley, and Iberian Peninsula, and then, when glaciation retreated, the rest of continental Europe. Urban development began in the Po Valley much later than in southern Italy or Greece. The first known ancient inhabitants of the thick forests and swamps were the Ligurians, who may have been an
Indo-European The Indo-European languages are a language family native to the northern Indian subcontinent, most of Europe, and the Iranian plateau with additional native branches found in regions such as Sri Lanka, the Maldives, parts of Central Asia (e. ...
people. After the progressive immigration in the 7th century BC of
Celtic Celtic, Celtics or Keltic may refer to: Language and ethnicity *pertaining to Celts, a collection of Indo-European peoples in Europe and Anatolia **Celts (modern) *Celtic languages **Proto-Celtic language *Celtic music *Celtic nations Sports Foot ...
peoples known as the Insubres (hence the name of Insubria sometimes being given to northwestern
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
), the southern and central regions were conquered and colonised here and there by a pre-Indo-European people, the
Etruscans The Etruscan civilization ( ) was an ancient civilization created by the Etruscans, a people who inhabited Etruria in List of ancient peoples of Italy, ancient Italy, with a common language and culture, and formed a federation of city-states. Af ...
, who left names such as
Parma Parma (; ) is a city in the northern Italian region of Emilia-Romagna known for its architecture, Giuseppe Verdi, music, art, prosciutto (ham), Parmesan, cheese and surrounding countryside. With a population of 198,986 inhabitants as of 2025, ...
,
Ravenna Ravenna ( ; , also ; ) is the capital city of the Province of Ravenna, in the Emilia-Romagna region of Northern Italy. It was the capital city of the Western Roman Empire during the 5th century until its Fall of Rome, collapse in 476, after which ...
and Felsina, the ancient name of
Bologna Bologna ( , , ; ; ) is the capital and largest city of the Emilia-Romagna region in northern Italy. It is the List of cities in Italy, seventh most populous city in Italy, with about 400,000 inhabitants and 150 different nationalities. Its M ...
. The Etruscan domination left significant marks and introduced urban civilisation, but was short-lived. Its inhabitants, the Venetics, probably being a distinct group who, being skillful merchants, were, in time, also culturally influenced by both
Etruscans The Etruscan civilization ( ) was an ancient civilization created by the Etruscans, a people who inhabited Etruria in List of ancient peoples of Italy, ancient Italy, with a common language and culture, and formed a federation of city-states. Af ...
and
Greeks Greeks or Hellenes (; , ) are an ethnic group and nation native to Greece, Greek Cypriots, Cyprus, Greeks in Albania, southern Albania, Greeks in Turkey#History, Anatolia, parts of Greeks in Italy, Italy and Egyptian Greeks, Egypt, and to a l ...
. By 500 BC the Etruscans were gradually displaced from the region by migrating Gauls.


Middle Ages

Once the long '' Pax Romana'' showed signs of weakening, and after enduring the passage of several Germanic invaders, and even that of
Attila Attila ( or ; ), frequently called Attila the Hun, was the ruler of the Huns from 434 until his death in early 453. He was also the leader of an empire consisting of Huns, Ostrogoths, Alans, and Gepids, among others, in Central Europe, C ...
and his
Huns The Huns were a nomadic people who lived in Central Asia, the Caucasus, and Eastern Europe between the 4th and 6th centuries AD. According to European tradition, they were first reported living east of the Volga River, in an area that was par ...
, the Po valley was to find no peace. The Gothic War and Justinian's plague devastated the Padan population. In this scenario of desolation, from which many people had fled to the mountains for safety (making them fairly populated till the 20th century) came the Germanic
Lombards The Lombards () or Longobards () were a Germanic peoples, Germanic people who conquered most of the Italian Peninsula between 568 and 774. The medieval Lombard historian Paul the Deacon wrote in the ''History of the Lombards'' (written betwee ...
, a warrior people who gave their name to almost the whole of the Po valley:
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
. In the Middle Ages the term was used to indicate all of northern Italy. The Lombards divided their domain in duchies, often contending for the throne;
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
and Friuli, in the extreme west and east end respectively, seem to have been the most powerful, whereas the capital soon shifted from
Verona Verona ( ; ; or ) is a city on the Adige, River Adige in Veneto, Italy, with 255,131 inhabitants. It is one of the seven provincial capitals of the region, and is the largest city Comune, municipality in the region and in Northeast Italy, nor ...
to
Pavia Pavia ( , ; ; ; ; ) is a town and comune of south-western Lombardy, in Northern Italy, south of Milan on the lower Ticino (river), Ticino near its confluence with the Po (river), Po. It has a population of c. 73,086. The city was a major polit ...
. Monza also was an important town in that time, more so than ruined
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
. The Lombards' harsh,
caste A caste is a Essentialism, fixed social group into which an individual is born within a particular system of social stratification: a caste system. Within such a system, individuals are expected to marry exclusively within the same caste (en ...
-like rule over the natives softened somewhat with their conversion from
Arianism Arianism (, ) is a Christology, Christological doctrine which rejects the traditional notion of the Trinity and considers Jesus to be a creation of God, and therefore distinct from God. It is named after its major proponent, Arius (). It is co ...
to
Catholicism The Catholic Church (), also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.27 to 1.41 billion baptized Catholics Catholic Church by country, worldwid ...
. The Lombard kingdom was overthrown in 774 by
Charlemagne Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...
and his Frankish armies, becoming a prized part of the
Carolingian Empire The Carolingian Empire (800–887) was a Franks, Frankish-dominated empire in Western and Central Europe during the Early Middle Ages. It was ruled by the Carolingian dynasty, which had ruled as List of Frankish kings, kings of the Franks since ...
, forming the
kingdom of Italy The Kingdom of Italy (, ) was a unitary state that existed from 17 March 1861, when Victor Emmanuel II of Kingdom of Sardinia, Sardinia was proclamation of the Kingdom of Italy, proclaimed King of Italy, until 10 June 1946, when the monarchy wa ...
, always with its capital in Pavia. The affirmation of large landownership from the eighth/ninth centuries accelerated the process of land reclamation and intensified land use, transforming the landscape of the Po Valley. After the chaotic feudal dissolution of the empire and much fighting among pretenders to the imperial crown, Otto I of
Saxony Saxony, officially the Free State of Saxony, is a landlocked state of Germany, bordering the states of Brandenburg, Saxony-Anhalt, Thuringia, and Bavaria, as well as the countries of Poland and the Czech Republic. Its capital is Dresden, and ...
set the stage for the following phase of the region's history by adding the Po Valley to the
Holy Roman Empire The Holy Roman Empire, also known as the Holy Roman Empire of the German Nation after 1512, was a polity in Central and Western Europe, usually headed by the Holy Roman Emperor. It developed in the Early Middle Ages, and lasted for a millennium ...
of the Germanic nation in 962. In
Veneto Veneto, officially the Region of Veneto, is one of the 20 regions of Italy, located in the Northeast Italy, north-east of the country. It is the fourth most populous region in Italy, with a population of 4,851,851 as of 2025. Venice is t ...
, the lagoon capital of
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
, emerged a great sea power in alliance with its old master, the
Byzantine Empire The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived History of the Roman Empire, the events that caused the ...
. In time the
Comuni A (; : , ) is an administrative division of Italy, roughly equivalent to a township or municipality. It is the third-level administrative division of Italy, after regions () and provinces (). The can also have the City status in Italy, titl ...
emerged, as towns thrived in commerce. Soon
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
became the most powerful city of the central plain of Lombardy proper, and despite being razed in 1162, it was a Milan-driven
Lombard League The Lombard League (; ) was an alliance of cities formed in 1167, and supported by the popes, to counter the attempts by the Hohenstaufen Holy Roman emperors to establish direct royal administrative control over the cities of the Kingdom of It ...
with
Papal The pope is the bishop of Rome and the visible head of the worldwide Catholic Church. He is also known as the supreme pontiff, Roman pontiff, or sovereign pontiff. From the 8th century until 1870, the pope was the sovereign or head of sta ...
benediction that defeated emperor
Frederick Barbarossa Frederick Barbarossa (December 1122 – 10 June 1190), also known as Frederick I (; ), was the Holy Roman Emperor from 1155 until his death in 1190. He was elected King of Germany in Frankfurt on 4 March 1152 and crowned in Aachen on 9 March 115 ...
at the Battle of Legnano in 1176. Between the 10th and 13th centuries, concurrent with the
Medieval Warm Period The Medieval Warm Period (MWP), also known as the Medieval Climate Optimum or the Medieval Climatic Anomaly, was a time of warm climate in the North Atlantic region that lasted from about to about . Climate proxy records show peak warmth occu ...
climate phase, the European population grew substantially, almost tripling (in northern and central Italy, the urban population doubled), and increasing the demand for cultivated lands. Cereals became a more significant constituent in the average diet and in the agrarian regime compared to the centuries before, leading populations to reconfigure the medieval natural landscape for agricultural purposes. In creating new land for cultivation and settlement, the European communities triggered a massive landscape transformation through woodland clearance, arable intensification, the development of irrigation systems and the drainage of wetlands. Land reclamations works profoundly modified many European regions. In central Po Plain the earliest evidence of attempts to clear the forests and drain the wetlands is mentioned in historical documents from the late 8th century, but only from the 10th to 13th centuries were land and water management activities actually carried out widely.


Economy

The Po Valley is one of the most important industrial and agricultural areas in Europe. Hydroelectricity is produced by the flow of the Po. The river is extensively used for irrigation for the region's agriculture.


Pollution

Po valley is considered the worst area in Europe for air quality. In March 2019, the
European Space Agency The European Space Agency (ESA) is a 23-member International organization, international organization devoted to space exploration. With its headquarters in Paris and a staff of around 2,547 people globally as of 2023, ESA was founded in 1975 ...
(ESA) published images of
nitrogen dioxide Nitrogen dioxide is a chemical compound with the formula . One of several nitrogen oxides, nitrogen dioxide is a reddish-brown gas. It is a paramagnetic, bent molecule with C2v point group symmetry. Industrially, is an intermediate in the s ...
concentrations taken from the Sentinel-5P satellite. These images show a big red area, made of nitrogen dioxide and fine particles, situated above the Po Valley area, which incorporates the city of
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
,
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
, and
Bologna Bologna ( , , ; ; ) is the capital and largest city of the Emilia-Romagna region in northern Italy. It is the List of cities in Italy, seventh most populous city in Italy, with about 400,000 inhabitants and 150 different nationalities. Its M ...
. Milan and Turin share high levels of
ozone Ozone () (or trioxygen) is an Inorganic compound, inorganic molecule with the chemical formula . It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope , break ...
and nitrogen oxides, which are mainly produced by cars' diesel and petrol engines. To shed light on the danger for humans living polluted environments, Chicago Energy Policy Institute has developed the Air Quality Life Index (AQLI), a system capable of analyzing
air pollution Air pollution is the presence of substances in the Atmosphere of Earth, air that are harmful to humans, other living beings or the environment. Pollutants can be Gas, gases like Ground-level ozone, ozone or nitrogen oxides or small particles li ...
worldwide. According to AQLI findings, Po valley air pollution affects inhabitants so hard that it cuts off about half a year of their life expectancy. The main reasons for the high amount of air pollution over the Po valley are strictly connected to livestock and factories. The so-called "NPK fertilizers", made of nitrogen, phosphorus and potassium, along with manure emissions from intensive breeding and high levels of nitrogen dioxide released by diesel and petrol engines are all accountable for this disastrous air condition in northern Italy. The region of
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
produces also vast amounts of animal waste, a big contributor to pollution. It delivers more than 40 percent of Italy's milk production, for example, while over half of the Italian pig production is located in the Po Valley. According to research published in ''
The Lancet ''The Lancet'' is a weekly peer-reviewed general medical journal, founded in England in 1823. It is one of the world's highest-impact academic journals and also one of the oldest medical journals still in publication. The journal publishes ...
Planetary Health'' in January 2021, which estimates the death rate associated with fine particulate matter (PM2.5) and nitrogen dioxide (NO2) pollution in 1000 European cities,
Brescia Brescia (, ; ; or ; ) is a city and (municipality) in the region of Lombardy, in Italy. It is situated at the foot of the Alps, a few kilometers from the lakes Lake Garda, Garda and Lake Iseo, Iseo. With a population of 199,949, it is the se ...
and
Bergamo Bergamo ( , ; ) is a city in the Alps, alpine Lombardy region of northern Italy, approximately northeast of Milan, and about from the alpine lakes Lake Como, Como and Lake Iseo, Iseo and 70 km (43 mi) from Lake Garda, Garda and Lake ...
in
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
have the highest death rate from fine particulate matter (PM2.5) in Europe.
Vicenza Vicenza ( , ; or , archaically ) is a city in northeastern Italy. It is in the Veneto region, at the northern base of the Monte Berico, where it straddles the Bacchiglione, River Bacchiglione. Vicenza is approximately west of Venice and e ...
(
Veneto Veneto, officially the Region of Veneto, is one of the 20 regions of Italy, located in the Northeast Italy, north-east of the country. It is the fourth most populous region in Italy, with a population of 4,851,851 as of 2025. Venice is t ...
) and
Saronno Saronno (; ) is a ''comune'' of Lombardy, Italy, in the province of Varese. It received the honorary title of city with a presidential decree in 1960. With an estimated population of inhabitants, it is the most densely populated among the big m ...
(Lombardy) are in fourth and eighth place, respectively, in a top ten of ten cities.
Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...
and
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
are also at the top of the European ranking—3rd and 5th respectively—in terms of increased mortality from nitrogen dioxide, a gas that is produced mainly from traffic and in particular from diesel vehicles, while
Verona Verona ( ; ; or ) is a city on the Adige, River Adige in Veneto, Italy, with 255,131 inhabitants. It is one of the seven provincial capitals of the region, and is the largest city Comune, municipality in the region and in Northeast Italy, nor ...
,
Treviso Treviso ( ; ; ) is a city and (municipality) in the Veneto region of northern Italy. It is the capital of the province of Treviso and the municipality has 87.322 inhabitants (as of December 2024). Some 3,000 live within the Venetian wall ...
,
Padova Padua ( ) is a city and ''comune'' (municipality) in Veneto, northern Italy, and the capital of the province of Padua. The city lies on the banks of the river Bacchiglione, west of Venice and southeast of Vicenza, and has a population of ...
, Como and
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
rank eleventh, fourteenth, fifteenth, seventeenth and twenty-third respectively. The data show that many cities in the Po Valley suffer the most serious impact at European level due to poor air quality, first of all the metropolitan area of Milan, thirteenth in the ranking in terms of fine particulate impact, where any year 3967 premature deaths occur—approximately 9% of the total.


References


External links

* {{Authority control Geographical, historical and cultural regions of Italy Plains of Italy Landforms of Piedmont Landforms of Lombardy Landforms of Emilia-Romagna Landforms of Veneto