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70-591: It is characterized by its large discharge (several rivers over 1,000 km have a discharge inferior or equal to the Po). It is, with the Rhône and Nile , one of the three Mediterranean rivers with the largest water discharge. As a result of its characteristics, the river is subject to heavy flooding. Consequently, over half its length is controlled with embankments . The river flows through many important Italian cities, including Turin , Piacenza , Cremona and Ferrara . It

140-399: A fluvial hydrologist studying natural river systems may define discharge as streamflow , whereas an engineer operating a reservoir system may equate it with outflow , contrasted with inflow . A discharge is a measure of the quantity of any fluid flow over unit time. The quantity may be either volume or mass. Thus the water discharge of a tap (faucet) can be measured with a measuring jug and

210-403: A minute. Measurement of cross sectional area and average velocity, although simple in concept, are frequently non-trivial to determine. The units that are typically used to express discharge in streams or rivers include m /s (cubic meters per second), ft /s (cubic feet per second or cfs) and/or acre-feet per day. A commonly applied methodology for measuring, and estimating, the discharge of

280-401: A river is based on a simplified form of the continuity equation . The equation implies that for any incompressible fluid, such as liquid water, the discharge (Q) is equal to the product of the stream's cross-sectional area (A) and its mean velocity ( u ¯ {\displaystyle {\bar {u}}} ), and is written as: where For example, the average discharge of

350-529: A slow recession . Because the peak flow also corresponds to the maximum water level reached during the event, it is of interest in flood studies. Analysis of the relationship between precipitation intensity and duration and the response of the stream discharge are aided by the concept of the unit hydrograph , which represents the response of stream discharge over time to the application of a hypothetical "unit" amount and duration of rainfall (e.g., half an inch over one hour). The amount of precipitation correlates to

420-400: A stopwatch. Here the discharge might be 1 litre per 15 seconds, equivalent to 67 ml/second or 4 litres/minute. This is an average measure. For measuring the discharge of a river we need a different method and the most common is the 'area-velocity' method. The area is the cross sectional area across a river and the average velocity across that section needs to be measured for a unit time, commonly

490-413: A sufficiently strong force to produce significant sedimentation. Settling is the process by which particulates move towards the bottom of a liquid and form a sediment . Particles that experience a force, either due to gravity or due to centrifugal motion will tend to move in a uniform manner in the direction exerted by that force. For gravity settling, this means that the particles will tend to fall to

560-533: Is 503 m (1,650 ft) across. The vast valley around the Po is called the Po Basin or Po Valley (Italian Pianura Padana or Val Padana ); the main industrial area and the largest agricultural area in the country - accounting for 35% of Italian agricultural production . In 2002, more than 16 million people lived in the area, at the time nearly one-third of the population of Italy. The two main economic uses of

630-484: Is called aggradation . The rate of sedimentation is the thickness of sediment accumulated per unit time. For suspended load, this can be expressed mathematically by the Exner equation . Rates of sedimentation vary from less than 3 millimeters (0.12 in) per thousand years for pelagic sediment to several meters per thousand years in portions of major river deltas . However, long-term accumulation of sediments

700-399: 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

770-461: Is determined less by rate of sedimentation than by rate of subsidence, which creates accommodation space for sediments to accumulate over geological time scales. Most sedimentation in the geologic record occurred in relative brief depositional episodes separated by long intervals of nondeposition or even erosion. In estuarine environments, settling can be influenced by the presence or absence of vegetation. Trees such as mangroves are crucial to

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840-429: Is now degrading. Venice , which was originally built on islands off the coast, is most at risk due to subsidence, but the effect is realized in the Po delta as well. The causes are first a decrease in the sedimentation rate due to the locking of sediment behind hydroelectric dams and the deliberate excavation of sand from rivers for industrial purposes. Second, agricultural use of the river is heavy; during peak consumption

910-491: Is opposed by the diffusion of the particles. The distribution of sediment near the boundary comes into sedimentation equilibrium . Measurements of the distribution yields information on the nature of the particles. In geology , the term sedimentation is broadly applied to the entire range of processes that result in the formation of sedimentary rock, from initial formation of sediments by erosion of particles from rock outcrops, through sediment transport and settling, to

980-627: Is situated: Veneto and Emilia-Romagna . The Po Delta Regional Park in Emilia-Romagna, the largest, consists of four parcels of land on the right bank of the Po and to the south. Created by law in 1988, it was managed by a consortium, the Consorzio per la gestione del Parco , to which Ferrara and Ravenna provinces belong as well as nine comuni : Comacchio , Argenta , Ostellato , Goro , Mesola , Codigoro , Ravenna , Alfonsine , and Cervia . Executive authority resided in an assembly of

1050-456: Is the volumetric flow rate (volume per time, in units of m /h or ft /h) of a stream . It equals the product of average flow velocity (with dimension of length per time, in m/h or ft/h) and the cross-sectional area (in m or ft ). It includes any suspended solids (e.g. sediment), dissolved chemicals like CaCO 3 (aq), or biologic material (e.g. diatoms ) in addition to the water itself. Terms may vary between disciplines. For example,

1120-420: Is the falling of suspended particles through the liquid, whereas sedimentation is the final result of the settling process. In geology , sedimentation is the deposition of sediments which results in the formation of sedimentary rock . The term is broadly applied to the entire range of processes that result in the formation of sedimentary rock, from initial erosion through sediment transport and settling to

1190-839: Is the product of the islands of the northern ocean ( Baltic Sea )" and attributes its introduction into the Po Valley to the Veneti , the last link in a trade route to the north through Pannonia . Pliny ( Hist. Nat. , iii. 122) also gives the Ligurian name of the Po as Bodincus , which he translates as "bottomless". The root bod- has been generally analyzed as containing the PIE base * bhu(n)d(h) - seen in Sanskrit budhnah and Avestan buna - "bottom", Greek pythmen "foundation", Latin fundus "bottom", Old Irish bond "sole of

1260-416: Is the sum of processes within the hydrologic cycle that increase the water levels of bodies of water. Most precipitation occurs directly over bodies of water such as the oceans, or on land as surface runoff . A portion of runoff enters streams and rivers, and another portion soaks into the ground as groundwater seepage . The rest soaks into the ground as infiltration, some of which infiltrates deep into

1330-404: Is typically expressed in units of cubic meters per second (m³/s) or cubic feet per second (cfs). The catchment of a river above a certain location is determined by the surface area of all land which drains toward the river from above that point. The river's discharge at that location depends on the rainfall on the catchment or drainage area and the inflow or outflow of groundwater to or from

1400-669: The Busa di Tramontana to the north and the Busa di Scirocco to the south, while the mainstream, the Busa Dritta , enters Punta Maistra and exits finally past Pila lighthouse. Despite the park administration's definition of the active delta as beginning at Porto Viro, there is another active channel upstream from it at Santa Maria in Punta, where the Fiume Po divides into the Po di Goro and

1470-596: The European Union (EU) Water Framework Directive , 2000/60/EC. This takes in water management and flood risk plans antecedent. Between 2009 and 2015 the Po Valley Project (the implementation of the plan) took more than 60 measures, notably to: heighten and strengthen levees , increase flood-meadows , resume natural sediment transport and deposition points, enlarge wetlands, afforest, re-nature, promote biodiversity and recreational use. In Roman times

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1540-475: The Italian Lakes , and shared with Switzerland. The streams are now controlled by so many dams as to slow the river's sedimentation rate, causing geologic problems. The expansive, moist and fertile flood plain is reserved mainly for agriculture and is subject to flash floods , even though the overall quantity of water is lower than in the past and lower than demand. The main products of the farms around

1610-538: The Last Glacial Maximum around 20,000 years ago, which brought the Adriatic to a high point at about 5,500 years ago. Since then the Po delta had been prograding . The rate of coastal zone progradation between 1000 BC and 1200 AD was 4 m/yr. Human factors, however, brought about a change in the equilibrium in the mid-20th century with the result that the entire coastline of the northern Adriatic

1680-695: The Miocene Epoch, the Messinian (7–5 mya ), the Messinian salinity crisis , a near drying of the Mediterranean, was caused by the sea level dropping below the sill at the Strait of Gibraltar and the equilibrium between evaporation and replenishment shifting in favor of evaporation. At that time the Po Valley and the Adriatic depression were a single canyon system thousands of feet deep. On

1750-565: The Parco Regionale Veneto , one of the tracts under the authority of the Parco Delta del Po , contains the latest branches of the Po. The Po di Gnocca branches to the south followed by the Po di Maestra to the north at Porto Tolle . At Tolle downstream the Po di Venezia divides into the Po delle Tolle to the south and the Po della Pila to the north. The former exits at Bonelli. The latter divides again at Pila into

1820-415: The Po di Venezia . The fossil Po is the region of no longer active channels from the Po to the sea. It begins upstream from Ferrara . The Fiume Po currently flowing to the north of Ferrara is the result of a diversion at Ficarolo in 1152 made in the hope of relieving flooding in the vicinity of Ravenna . The diversion channel was at first called the Po di Ficarolo . The Fiume Po before then followed

1890-494: The Po di Volano , no longer connected to the Po, which ran to the south of Ferrara and exited near Volano . In Roman times it did not exit there but ran to the south as the Padus Vetus ("old Po") exiting near Comacchio , from which split the Po di Primaro exiting close to Ravenna . Before 1152 the seaward extension of today's delta, about 12 km (7.5 mi), did not exist. The entire region from Ravenna to Chioggia

1960-535: The Rhine river in Europe is 2,200 cubic metres per second (78,000 cu ft/s) or 190,000,000 cubic metres (150,000 acre⋅ft) per day. Because of the difficulties of measurement, a stream gauge is often used at a fixed location on the stream or river. A hydrograph is a graph showing the rate of flow (discharge) versus time past a specific point in a river, channel, or conduit carrying flow. The rate of flow

2030-476: The Taglio di Porto Viro , "Porto Viro cut-off". Their intent was to stop the gradual migration of the Po toward the lagoon of Venice, which would have filled up with sediment had contact been made. The subsequent town of Taglio di Po grew around the diversionary works. The lock of Volta Grimana blocked the old channel, now the Po di Levante , which flows to the Adriatic through Porto Levante. Below Taglio di Po

2100-637: The Vallée Étroite  [ it ; fr ] (literally, the Narrow Valley) running from Mont Thabor to the Italian ski resort of Bardonecchia . Although in France, Vallée Étroite is so remote it is essentially administered by Italy (telephone network, rubbish collections, etc.). Further minuscule parts of the Po's basin (measurable in the hundreds of metres of linear distance) within France are found in

2170-446: The attenuation of waves or currents, promoting the settlement of suspended particles. An undesired increased transport and sedimentation of suspended material is called siltation , and it is a major source of pollution in waterways in some parts of the world. High sedimentation rates can be a result of poor land management and a high frequency of flooding events. If not managed properly, it can be detrimental to fragile ecosystems on

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2240-450: The comuni of Alfonsine, Argenta, Cervia, Codigoro, Comacchio, Goro, Mesola, Ostellato and Ravenna. The 53,653 ha (132,580 acres) of the park contain wetlands, forest, dunes and salt pans. It has a high biodiversity , with 1,000–1,100 plant species and 374 vertebrate species, of which 300 are birds. The most recent part of the delta, which projects into the Adriatic between Chioggia and Comacchio , contains channels that connect to

2310-601: The drainage basin – nearly three times higher than estimated. On February 24, 2010, the Po was contaminated by an oil spill coming from a refinery in Villasanta through the Lambro , the Agenzia Nazionale Stampa Associata news agency has estimated it to be about 600,000 liters. Until 1989 water resources were administered regionally or locally. The major authority on the lower Po

2380-464: The lithification of the sediments. However, the strict geological definition of sedimentation is the mechanical deposition of sediment particles from an initial suspension in air or water. Sedimentation may pertain to objects of various sizes, ranging from large rocks in flowing water, to suspensions of dust and pollen particles, to cellular suspensions, to solutions of single molecules such as proteins and peptides . Even small molecules supply

2450-462: The lithification of the sediments. However, the term is more particularly applied to the deposition of sediments, and in the strictest sense, it applies only to the mechanical deposition of sediment particles from an initial suspension in air or water. Sedimentation results in the formation of depositional landforms and the rocks that constitute the sedimentary record . The building up of land surfaces by sedimentation, particularly in river valleys,

2520-399: The Adriatic and therefore is called the active delta by the park authorities, whereas the fossil delta contains channels that no longer connect the Po to the Adriatic (but once did). The active delta was created in 1604 when the city of Venice diverted the main stream, the Po grande or Po di Venezia , from its channel north of Porto Viro to the south of Porto Viro in a channel then called

2590-531: The Apennines filled the valley and the central Adriatic generally to a depth of 1,000 m (3,300 ft) to 2,000 m (6,600 ft) but from 2,000 m (6,600 ft) to 3,000 m (9,800 ft) off the current mouth of the Po, with pockets as deep as 6,000 m (20,000 ft). At the start of the Pleistocene the valley was full. Cycles of transgression and regression are detectable in

2660-569: The Elder has the most to say about the Padus of his times. Herodotus had expressed doubt concerning the existence of a river in Europe, Eridanos , which flowed into the northern sea, he said, from which amber came. He believed it was a Greek name (there are other Eridanos rivers in Greece), "invented by some poet," but makes no conjectures as to where it might be. Pliny points out that in his own time

2730-478: The Eridanos had become wrongly identified with the Padus . He does not know when or how, but like Herodotus, he blames the poets. Amber is supposed to have come from there. Phaëthon , son of the sun, struck by lightning changed into poplars and exuded tears every year, which is the source of amber (a myth of Pausanias ). Expressing surprise at the ignorance of the poets, Pliny says "There can be no doubt that amber

2800-839: The Ministry of Public Works, headed by a chairman appointed by the Head of State and the Council of Ministers. Its headquarters are in Venice. Its domain is the management and protection of the water system in Veneto , Mantua , Trento , Bolzano and Friuli-Venezia Giulia . In 1989 in response to the major geologic problems that were developing along the river Law no. 183/89 was passed authorizing The Po Basin Water Board (Autorità di bacino del fiume Po), which would direct operations concerning all

2870-555: The Po, for which the European Environment Agency cited the city. Since 2005, all sewage from Milan is treated in plants at Nosedo, San Rocco and Peschiera Borromeo. These treat the sewage from over 2.5 million inhabitants. In 2005, water from the Po was found to contain much benzoylecgonine , passed 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

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2940-455: The Po. Nine gates are 6.5 m (21 ft) high and two are 8 m (26 ft) high for sediment-scouring purposes. A spillway to the right passes through a hydroelectric station of 4 generators of 76 MW each operated by a 3.5–11 m (11–36 ft) head of water. The spillway connects to a diversionary canal subtending a 12 km (7.5 mi) loop of the Po. A ship lock 85 m (279 ft) long and 12 m (39 ft) wide next to

3010-399: The area, stream modifications such as dams and irrigation diversions, as well as evaporation and evapotranspiration from the area's land and plant surfaces. In storm hydrology, an important consideration is the stream's discharge hydrograph, a record of how the discharge varies over time after a precipitation event. The stream rises to a peak flow after each precipitation event, then falls in

3080-399: The bottom of the vessel, forming sludge or slurry at the vessel base. Settling is an important operation in many applications, such as mining , wastewater and drinking water treatment, biological science, space propellant reignition, Classification of sedimentation: When particles settling from a suspension reach a hard boundary, the concentration of particles at the boundary

3150-485: The corresponding discharge from the rating curve. If a continuous level-recording device is located at a rated cross-section, the stream's discharge may be continuously determined. Larger flows (higher discharges) can transport more sediment and larger particles downstream than smaller flows due to their greater force. Larger flows can also erode stream banks and damage public infrastructure. G. H. Dury and M. J. Bradshaw are two geographers who devised models showing

3220-406: The course was diverted to lessen the risk of devastating floods. The Tanaro is about 50 km (31 mi) longer than the upper Po at their confluence near Alessandria . The longest tributaries of the Po are Adda (313 km), Oglio (280 km), Tanaro (276 km) and Ticino (248 km). The Po Delta wetlands have been protected by the institution of two regional parks in the regions in which it

3290-525: The flow in places nearly dries up, causing local contention. As a result of decreased flow, salt water is intruding into the aquifers and coastal ground water. Eutrophication in standing waters and streams of low flow is on the increase. The valley is subsiding due to the extraction of ground water. Always prone to fog, the valley is subject to heavy smog due to industrial atmospheric emissions, especially from Turin . The city of Milan had no sewage treatment plants. Sewage went through channels directly into

3360-467: The foot". The word Bodincus appears in the place name Bodincomagus , a Ligurian town on the right bank of the Po downstream from today's Turin. The Po, along with other rivers in northern Italy , was the scene of numerous military episodes throughout the Middle Ages and all the major cities and coastal lordships were equipped with real river fleets. Particularly violent were the clashes between

3430-559: The form of small streamheads forced into France by the 1947 Peace Treaty of Paris as a punitive measure against Italy. These can be found on the Mont Cenis and Mongenevre passes. The former contains a reservoir dammed at the Po end and so technically constitutes part of its basin, although it contributes little to the water flow as the water is, by definition, retained by the dam. The Po is the longest river in Italy; at its widest point it

3500-439: The ground to replenish aquifers. Sedimentation Sedimentation is the deposition of sediments . It takes place when particles in suspension settle out of the fluid in which they are entrained and come to rest against a barrier. This is due to their motion through the fluid in response to the forces acting on them: these forces can be due to gravity , centrifugal acceleration , or electromagnetism . Settling

3570-456: The late Roman Republic and the early Roman Empire , long after the valley had been occupied successively by prehistoric and historic peoples: Ligures , Etruscans , Celts , Veneti , Umbri , and Romans. At that late date, the ancient authors were attempting to explain the provenance of the name. Perhaps the earliest of these, Polybius (2nd century BC), uses Pados (in Greek) and says that it

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3640-424: The level of the stream is described by a rating curve . Average velocities and the cross-sectional area of the stream are measured for a given stream level. The velocity and the area give the discharge for that level. After measurements are made for several different levels, a rating table or rating curve may be developed. Once rated, the discharge in the stream may be determined by measuring the level, and determining

3710-744: The naval squads of the Ghibelline municipalities ( Cremona and Pavia ) and those of the municipalities of the Lombard league during the thirteenth century and between the Venetian fleet and that of the Duchy of Milan in the fifteenth century. The Po is often identified with the Eridanos or Eridanus river of Greek mythology . This mythical river is the namesake of the constellation Eridanus . Discharge (hydrology) In hydrology , discharge

3780-540: The presidents of the provinces, the mayors of the comuni and the board of directors. They employed a Technical-Scientific Committee and a Park Council to carry out directives. In 1999 the park was designated a World Heritage Site by UNESCO and was added to "Ferrara, City of the Renaissance, and its Po Delta." From 2012 the park is managed by the Ente di Gestione per i Parchi e la Biodiversità - Delta del Po , composed by

3850-583: The relationship between discharge and other variables in a river. The Bradshaw model described how pebble size and other variables change from source to mouth; while Dury considered the relationships between discharge and variables such as stream slope and friction. These follow from the ideas presented by Leopold, Wolman and Miller in Fluvial Processes in Geomorphology . and on land use affecting river discharge and bedload supply. Inflow

3920-660: The rest of the non-Italy basin is in Switzerland , primarily in the canton of Ticino , which is essentially drained by the river Ticino rising in the Gotthard Area , and includes Lake Maggiore and Lake Lugano . A small part of the canton of Grisons drains to the Po, partly via the Ticino. The Simplon Valley in the canton of Valais is drained by the Diveria . A minute section of the Po basin belongs to France in

3990-417: The river are cereals including – unusually for Europe – rice , which requires heavy irrigation . The latter method is the chief consumer of surface water, while industrial and human consumption use underground water. The Po has 141 tributaries . They include (R on the right bank, L on the left, looking downstream ): The Reno (R) was a tributary of the Po until the middle of the eighteenth century when

4060-399: The river. However, transit is severely hampered during summer months by low water levels. At the village of Isola Serafini in the comune of Monticelli d'Ongina , Piacenza Province , 40 km (25 mi) downstream from Piacenza, a 362 m (1,188 ft) long, 20 m (66 ft) high gate dam featuring eleven 30 m (98 ft) openings gated by vertical lift gates, crosses

4130-471: The severity, resulting in a "decrease in precipitation during critical crop growing seasons". In July 2022, the Italian government declared a state of emergency in the regions Emilia-Romagna, Lombardy, Piedmont, Veneto and Friuli-Venezia Giulia. Water levels decreased and revealed large riverbed areas and lost objects. The Po is first certainly identified in the Graeco-Roman historians and geographers of

4200-719: The southwest the Apennine Mountains bordered a land mass termed Tyrrhenis geologically. Their orogeny was just being completed in the Miocene. On the north the Alpine Orogeny had already created the Alps . At the end of the Messinian the ocean broke through the sill and the Mediterranean refilled. The Adriatic transgressed into all of northern Italy. In the subsequent Pliocene sedimentary outwash primarily from

4270-499: The station passes some traffic through the canal, but above the dam traffic is mainly barges. The average flow at the dam is 854 m/s, with a 12,800 m/s maximum. The historic average flow for June is 1,805 cubic metres per second. In late June 2022, the flow measured in Ferrara fell below an average of 145 cubic metres per second. Climate change has caused several droughts across Northern Italy, with predictions for their frequency and

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4340-589: The valley and the Adriatic as far as its centre and in the southern Adriatic. From the Pleistocene alternation of maritime and alluvial sediments occur as far west as Piacenza . The exact sequences at various locations have been studied extensively. Apparently the sea advanced and receded over the valley in conformance to an equilibrium between sedimentation and glacial advance or recession at 100,000-year intervals and 100 m (330 ft) to 120 m (390 ft) fluctuation of sea level. An advance began after

4410-476: The valley are for industry and for agriculture. The industrial centres, such as Turin and Milan, are located on higher terrain, away from the river. They rely for power on the numerous hydroelectric stations in or on the flanks of the Alps, and on the coal/oil power stations which use the water of the Po basin as coolant. Drainage from the north is mediated through several large, scenic lakes, commonly referred to as

4480-420: The volume of water (depending on the area of the catchment) that subsequently flows out of the river. Using the unit hydrograph method, actual historical rainfalls can be modeled mathematically to confirm characteristics of historical floods, and hypothetical "design storms" can be created for comparison to observed stream responses. The relationship between the discharge in the stream at a given cross-section and

4550-554: The water resources in the Po basin (see under Po Valley ). Its headquarters have been in Parma since its inception in 1990. It considers itself a synergy among all the institutions concerned with the preservation and development of the Po basin. It is administered by officials chosen from the administrations of the constituent regions and provinces. In 2009 the water board began its Integrated River Basin Management Plan to meet

4620-496: The waterway was navigable as far upstream as Turin . Today the waterway is navigable for substantial craft (up to 1350 tonnes —the European Class IV waterway standard ) from Cremona to the river delta on the Adriatic . Passage by smaller vessels is available for some distance above Cremona. In the lower reaches the surrounding basin is generally flat and it is served by a complicated network of small canals linked to

4690-643: Was dense swamps, explaining why the Via Aemilia was constructed between Rimini and Piacenza and did not begin further north. The Mediterranean Basin is a depression in the Earth 's crust caused by the African Plate slipping under the Eurasian Plate . Typically in geologic history the depression is filled with sea water under various geologic names such as Tethys Sea . In the last period of

4760-533: Was the Magistrato alle Acque di Venezia , first formed in the 16th-century Republic of Venice . It made all the decisions concerning the diversion of the lower river. Most part of the delta is still in Veneto . In 1907 under the Kingdom of Italy the agency became the Magistrato alle Acque and took responsibility for all the water resources in northeastern Italy. Currently it is a decentralized institution of

4830-446: Was the territory of Roman Cisalpine Gaul , divided into Cispadane Gaul (south of the Po) and Transpadane Gaul (north of the Po). The Po has a drainage area of 74,000 km in all, 70,000 of those being in Italy, of which 41,000 is in montane environments and 29,000 on the plain. The slope of the Po's river valley decreases from 0.35% in the west to 0.14% in the east, a low gradient. Along its path lie 450 standing lakes. Almost all of

4900-483: Was to be identified with the Eridanos of the poets. Moreover, the country people call it Bodencus . This implies that a "country" population either remained from prehistoric times or adopted the name in use by that substrate. The name has been segmented as Bod-encus or Bod-incus , the suffix being characteristic of the ancient Ligurian language of northern Italy, southern France, Corsica and elsewhere. Pliny

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