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Lake Trasimeno ( , also ; it, Lago Trasimeno ; la, Trasumennus; ett, Tarśmina), also referred to as Trasimene ( ) or Thrasimene in English, is a lake in the
province of Perugia The Province of Perugia ( it, Provincia di Perugia) is the larger of the two provinces in the Umbria region of Italy, comprising two-thirds of both the area and population of the region. Its capital is the city of Perugia. The province covered al ...
, in the
Umbria it, Umbro (man) it, Umbra (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , ...
region of Italy on the border with
Tuscany it, Toscano (man) it, Toscana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = Citizenship , demographics1_footnotes = , demographics1_title1 = Italian , demogra ...
. The lake is south of the river Po and north of the nearby river
Tiber The Tiber ( ; it, Tevere ; la, Tiberis) is the third-longest List of rivers of Italy, river in Italy and the longest in Central Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing through Tuscany, Umbria, and Lazio, where ...
and has a surface area of , making it the fourth largest in Italy, slightly smaller than Lake Como. Only two minor streams flow directly into the Lake and none flows out. The water level of the lake fluctuates significantly according to rainfall levels and the seasonal demands from the towns, villages and farms near the shore.


Description

Trasimeno is shallow, muddy, and rich in fish, including pike, carp, and tench. During the last 10 years it has been 5 meters deep, on average. Lake Trasimeno is an apparently
endorheic An endorheic basin (; also spelled endoreic basin or endorreic basin) is a drainage basin that normally retains water and allows no outflow to other external bodies of water, such as rivers or oceans, but drainage converges instead into lakes ...
body of water with no natural above-ground outlet. However, the Romans dug an artificial drainage tunnel in the San Savino area, which was restored in the Renaissance; a modern canal, the Emissario del Trasimeno, was built in 1898, flowing into the Caina, the Nestore, and eventually the
Tiber The Tiber ( ; it, Tevere ; la, Tiberis) is the third-longest List of rivers of Italy, river in Italy and the longest in Central Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing through Tuscany, Umbria, and Lazio, where ...
. The shallow waters meant that malarial mosquitoes prospered. To combat
malaria Malaria is a mosquito-borne infectious disease that affects humans and other animals. Malaria causes symptoms that typically include fever, tiredness, vomiting, and headaches. In severe cases, it can cause jaundice, seizures, coma, or death. S ...
, some mosquito larvae-eating fish were imported from the United States during the 1950s. These fish are widely scattered, and some live in the lakes near Trasimeno. Although billions of larvae are eaten, there are still many mosquitoes and other insects. The lake's water quality is still very good, as a study by conservation group Italia Nostra showed in 2005. This is believed to be largely due to the small population and a lack of large farms in the area. A proposal to drain the lake to solve the problems of malaria and depth changes was rejected. At the end of the 19th century, the level changes were solved by building a channel near San Feliciano. This also lessened the malaria problem.


Origins and early history

Three million years ago, there was a shallow sea in this part of
Umbria it, Umbro (man) it, Umbra (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , ...
. A depression formed by geologic fractures allowed the present-day Lake Trasimeno to form. Historically, Trasimeno was known as the Lake of
Perugia Perugia (, , ; lat, Perusia) is the capital city of Umbria in central Italy, crossed by the River Tiber, and of the province of Perugia. The city is located about north of Rome and southeast of Florence. It covers a high hilltop and pa ...
, being important for northwestern
Umbria it, Umbro (man) it, Umbra (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , ...
and for the Tuscan Chiana district. In prehistoric times, this lake extended almost to Perugia. Trasimeno is a mythological figure, joined with Agilla, a nymph born in Agello, now a hill midway between Perugia and Trasimeno, formerly an island in the lake. The first civilization to inhabit this area was the
Etruscans The Etruscan civilization () was developed by a people of Etruria in ancient Italy with a common language and culture who formed a federation of city-states. After conquering adjacent lands, its territory covered, at its greatest extent, rou ...
; three of the main Etruscan cities - Perugia, Chiusi, and Cortona - are within of the lake. Little physical evidence remains from the period of Etruscan or later Roman settlement.
Castiglione del Lago Castiglione del Lago is a town in the province of Perugia of Umbria (central Italy), on the southwest corner of Lake Trasimeno. Orvieto is south, Chiusi is to the south west, Arezzo is to the north west, Cortona is to the north and Perugi ...
has some Roman ruins and its main streets are structured like a chessboard in the Roman style. The Battle of Lake Trasimeno occurred on the northern shore of the lake in April 217 B.C. during the Second Punic War. The exact location of the battle is unknown because the lake then extended further north; the battle could have been fought between Cortona and Tuoro. Near Cortona, there is a place called 'Ossaia', in Italian meaning ossuary. Another place with reference to the battle is the place named Sanguineto, whose name is connected with the Italian term "sangue" meaning blood or, probably, bloody place.


Local climate

The Trasimeno climate is fairly warm, with moderate winters. Summers can be very warm and humid, but in general the lake moderates the climate both in cold and warm conditions because even shallow water gives a moderate thermic inertia. From May to September, the temperature is high enough to allow swimming. In 1929, a cold winter froze the whole of the lake's surface, and cars could be driven over the ice. Cold winters in 1957, 1985 and 2002 caused heavy damage to the olive trees nearby. A less severe freeze happened in 1991. Given the latitude of the lake, freezing remains a rare occurrence.


Water level

The water level of the lake is very dependent on the amount of seasonal rain and can change significantly from one year to the other. The water level is usually at its minimum level after summer (in September or October) and at its highest during spring (in April or May). Trasimeno has high hills to the east, which help to capture rain and partially protect the lake from cold eastern winds. Most of the water in the lake comes from the network of streams on the western side of the lake. The reference water level of the lake is set at 257.33 AMSL. This level corresponds to a maximum depth of around 6m. Actions are planned to reduce the water level when it climbs above 257.60 AMSL, but since the maximum level was set the lake has reached that height only occasionally. After World War II, the lake's shores retreated a kilometre in the west (the eastern shore is deeper and more steeply sloped). In 1958 the water of the lake reached the lowest recorded level, at -2.63m vs reference level. Since 1958 the level increased again to reach reference level in June 1989. After the water level started again to fall, and in 2003 the shore retreated over and the level fell in October 2003 to -1.85m vs reference. From 2004 to the summer of 2006, there was plenty of rain. of rain fell during the last 20 days of August 2005 and over during the remaining part of the year. During the following five years rain was insufficient (especially in 2006 and 2007 winters were very dry and summers hot) so by October 2012 the water level was -1.51 m vs the reference. Fortunately, since 2012 winters have been very rainy so the level of the lake has progressively increased to reach in February 2014 the reference level. In April 2014 the water level increased further to reach 0.30 m above the reference. A channel from the reservoir at Montedoglio in Tuscany to supply agriculture and lakeside towns (and thereby eliminate the need to draw water from the lake) was opened in 2012.


Conservation

The inhabitants of the
communes An intentional community is a voluntary residential community which is designed to have a high degree of social cohesion and teamwork from the start. The members of an intentional community typically hold a common social, political, relig ...
around Trasimeno and the
Umbrian Umbrian is an extinct Italic language formerly spoken by the Umbri in the ancient Italian region of Umbria. Within the Italic languages it is closely related to the Oscan group and is therefore associated with it in the group of Osco-Umbrian ...
people have successfully protected their lake, whose waters are fit for swimming and whose valleys and islands are intact environments. In 1995 a natural park was established over the entire surface and the shores. A bicycle path was opened in 2003 around the lake that allows tourists to explore it. There are also cross-country paths, especially over the hills on the eastern side. During the last twenty years several alien species ( Louisiana crawfish,
black bullhead The black bullhead or black bullhead catfish (''Ameiurus melas'') is a species of bullhead catfish. Like other bullhead catfish, it has the ability to thrive in waters that are low in oxygen, brackish, turbid and/or very warm. It also has barbels ...
,
stone moroko The stone moroko (''Pseudorasbora parva''), also known as the topmouth gudgeon, is a fish belonging to the Cyprinid family, native to Asia, but introduced and now considered an invasive species in Europe and North America. The fish's size is rare ...
and
goldfish The goldfish (''Carassius auratus'') is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is commonly kept as a pet in indoor aquariums, and is one of the most popular aquarium fish. Goldfish released into the wild have bec ...
) have been introduced in the lake, putting under threat the autochthonous water life. The goldfish was the first alien species to be introduced in the lake and today accounts for about 50% of the total fish presence.


Surroundings

Half of Trasimeno is surrounded by hills, rich in olives that are an important agricultural resource. On the western shore, near Tuscany, there are vineyards, and fruit and vegetables are grown. The hills are much lower and the climate is warmer.
Monte Subasio Mount Subasio is a mountain of the Apennine mountains, in the province of Perugia, Umbria, central Italy. On its slopes are located the ancient towns of Assisi and Spello. The mountain stands about 1290 metres above sea level. Its pink color ...
near Assisi, about to the east, and
Monte Amiata Mount Amiata is the largest of the lava domes in the Amiata lava dome complex located about 20 km northwest of Lake Bolsena in the southern Tuscany region of Italy. It is located within the provinces of Grosseto and Siena. Geology Mount Am ...
, about to the west, can be seen. The vegetation includes pines, willows and poplars around the shores, many over 30 m tall. The main towns are
Passignano sul Trasimeno Passignano sul Trasimeno is a ''comune'' (municipality) in the Province of Perugia in the Italian region of Umbria, located about 20 km northwest of Perugia. Passignano was home to a historic Italian airplane factory, the SAI Ambrosini, now ...
, Tuoro, Monte del Lago, Torricella, San Feliciano, San Arcangelo,
Castiglione del Lago Castiglione del Lago is a town in the province of Perugia of Umbria (central Italy), on the southwest corner of Lake Trasimeno. Orvieto is south, Chiusi is to the south west, Arezzo is to the north west, Cortona is to the north and Perugi ...
, and Borghetto. Castiglione del Lago has the longest shore, being on the only significant peninsula of the lake. This may have been an island that was joined to the shore by the Romans. Surrounding the lake are old small towns, and isolated castles, like
Zocco In architecture, a socle is a short plinth used to support a pedestal, sculpture, or column. In English, the term tends to be most used for the bases for rather small sculptures, with plinth or pedestal preferred for larger examples. This is n ...
castle and a tower near Passignano. Monte del Lago was originally built to control the road from Trasimeno to Perugia.


Aviation

The local airport, the Eleuteri, near Castiglione del Lago, was once one of the main aviation schools in Italy, with elegant buildings that were destroyed by retreating German troops in the summer of 1944. This airport was once almost as big as Castiglione. The mild climate and perfect visibility still allow the use of this airport for air meetings. A social center exists in the former airport. A major watercourse, the Paganico torrent, separated the airport from the town. Before this airport was constructed, there was a hydroscale in Castiglione del Lago. On the opposite shore, in Passignano, around away, there was an aircraft factory, the
SAI Ambrosini __NOTOC__ SAI Ambrosini was an Italian aircraft manufacturer established in Passignano sul Trasimeno, Italy, in 1922 as the ''Società Aeronautica Italiana''. It became SAI Ambrosini when it was acquired by the Ambrosini group in 1934. Prior to ...
. This is now abandoned as an industrial center, but is still used as an association center. It was founded around 80 years ago and the buildings still exist near the
Passignano sul Trasimeno Passignano sul Trasimeno is a ''comune'' (municipality) in the Province of Perugia in the Italian region of Umbria, located about 20 km northwest of Perugia. Passignano was home to a historic Italian airplane factory, the SAI Ambrosini, now ...
railway station. This company made several types of aircraft, designed by eng. Sergio Stefanutti. Aircraft were tested at Eleuteri airport, only few kilometers away from this factory. SAI was involved mainly with Macchi during World War II. Eleuteri was also used as test center for the Ambrosini SS.4, advanced canard aircraft, which crashed in the second flight and the project was abandoned.


Communications

Trasimeno is relatively far from every major Italian city, the nearest of which is Perugia. The Foligno–Terontola railway was completed in 1866, with the main rail station in Terontola, which has been at the junction with the
Florence–Rome railway The Florence–Rome railway is part of the traditional main north–south trunk line of the Italian railway network. The line is referred to by Ferrovie dello Stato (the State Railways) as the ''Linea Lenta'' (meaning "slow line", abbreviated ''L ...
since 1875. Smaller railway stations are in Passignano and Castiglione del Lago. Because of increased traffic, about 30 years ago a highway was built over the Passignano's road to Perugia. This highway passes near the north and the east shores of Trasimeno and goes to Perugia and Assisi. Many smaller roads, such as state highway 75, are also present, especially on the western side of the lake. The Autostrada A1 passes five kilometers () to the west of the Lake.


Navigation

Strict regulations apply for the navigation on the Lake. A protected strip is established for the entire perimeter of Lake Trasimeno for a distance of 150 meters from the shore of the lake and the shore of the islands. In the protected strip navigation is only permitted for craft having a maximum length of 9 meters at the waterline, propelled by oars or by sail, at a maximum speed of two knots. Exceptions apply to authorised boats propelled by motor only in the water in front of port areas or authorized landing places. There are ferryboats, 3 small, 2 medium, and two big (two decks) called Perusia and Agilla II, based in Passignano Port, also two dredges. There are ports in Castiglione del Lago (recently totally rebuilt), S. Arcangelo, S. Feliciano, Tuoro, and several minor anchorages.


Islands

There are three islands in the lake. The largest of these islands is Isola Polvese, almost 1 km2. The second largest,
Isola Maggiore Isola Maggiore is the second largest island (at approximately ) on Lake Trasimeno, in Umbria, central Italy. It is a ''frazione'' of the ''comune'' of Tuoro sul Trasimeno, and is the only inhabited island on the lake, with a current population o ...
, is the only inhabited one. The small fishing village, which reached its height in the 14th century, today has only around thirty residents. Most of the buildings, including the ruins of a
Franciscan , image = FrancescoCoA PioM.svg , image_size = 200px , caption = A cross, Christ's arm and Saint Francis's arm, a universal symbol of the Franciscans , abbreviation = OFM , predecessor = , ...
monastery, date from the 14th century. Maggiore is a 'hill', whereas Polvese is a more complex structure with plains and hills, and Minore resembles a sloped table. Minore is now uninhabited, but in the past had a village with over 500 residents. Many centuries ago, a castle with a pentagonal structure stood near the shore, near an
Olivetan The Olivetans, formally known as the Order of Our Lady of Mount Olivet, are a monastic order. They were founded in 1313 and recognised in 1344. They use the Rule of Saint Benedict and are a member of the Benedictine Confederation, where they ar ...
monastery. The castle still remains, and the ruins of the church and the monastery are almost totally preserved, despite the abandonment in the 17th century due to malaria. The malaria was eradicated only in the 1950s. There were other problems, since Trasimeno was fought over by
Chiusi Chiusi ( Etruscan: ''Clevsin''; Umbrian: ''Camars''; Ancient Greek: ''Klysion'', ''Κλύσιον''; Latin: ''Clusium'') is a town and ''comune'' in the province of Siena, Tuscany, Italy. History Clusium (''Clevsin'' in Etruscan) was one ...
,
Panicale Panicale is a ''comune'' (municipality) in the Province of Perugia in the Italian region Umbria. Located on the eastern slope of Mount Petrarvella, in the southeast of Valdichiana, it overlooks Lake Trasimeno and it is about 35 km far from Pe ...
, Perugia, and
Florence Florence ( ; it, Firenze ) is a city in Central Italy and the capital city of the Tuscany Regions of Italy, region. It is the most populated city in Tuscany, with 383,083 inhabitants in 2016, and over 1,520,000 in its metropolitan area.Bilan ...
. Florentine troops demolished Polvese in the 17th century, beginning its decline, until by the 19th century there was only a caretaker. Of the many houses, nothing remains. Minore Isle, near Maggiore, is now uninhabited, totally covered by local vegetation except for a small anchorage. In ancient times, there was a separation between the two communities, because Polvese was far away from Maggiore-Minore. According to local stories, the two communities fought against each other but the real problems were from the regional 'powers' that fought over this lake for centuries. A fishing technique, called 'Tuoro' or 'pesca da tuori', was used locally. This complex system consisted of a wooden trap in the water and a circular structure to hold the net around it. The nets trapped the fish that were then taken to the village to be dried. This system worked with a high water level, but was abandoned when the level dropped. A mock up of this system was built several years ago near Polvese Isle's port.


Castles

There are castles all around Trasimeno, many in the center of small towns while others are isolated and in ruins. Castiglione del Lago, Passignano, Magione, Maggiore, and Polvese islands all have castles, while Zocco castle, Montali castle, and others are on hilltops. The Guglielmi castle in Maggiore Isle was built in the late 19th century on the foundation of an old Franciscan church, and for many years was a popular place in the Trasimeno area. Until 1998 it was still visitable, then it was closed because the structure became dangerously unstable. It is now being restored by a new proprietor, but the work is far from completed. Between Monte del Lago and S.Feliciano is Zocco castle, ruined for decades. It is privately owned but unmaintained. It is one of the biggest castles of the area and the only one that, inside its sandstone walls, has a still untouched medieval keep. Some years ago it was probably inhabited, as there is a building fitted with a TV antenna, but now its only entry is closed. The best-preserved parts are the eastern and the southern walls, increasingly endangered because the wall's faults are enlarging. The rest of the walls are mostly demolished or have fallen down. One of the southern towers has two enormous cracks in the middle. The Vernazzano leaning tower (N43 13.210 E12 06.084), around in height, leans like the famous
Leaning Tower of Pisa The Leaning Tower of Pisa ( it, torre pendente di Pisa), or simply, the Tower of Pisa (''torre di Pisa'' ), is the ''campanile'', or freestanding bell tower, of Pisa Cathedral. It is known for its nearly four-degree lean, the result of an unst ...
. This unique remnant of an ancient castle was built before 1089, when the Marchiones family donated the whole castle to the monastery of
Città di Castello Città di Castello (); "Castle Town") is a city and ''comune'' in the province of Perugia, in the northern part of Umbria. It is situated on a slope of the Apennines, on the flood plain along the upper part of the river Tiber. The city is north of ...
. In 1202, it fell under control of Perugia and this city gained control of Northern Trasimeno. It was built on M.te Castiglione, near two rivers. The castle and the surrounding settlement at Vernazzano, were damaged by wars in 15th century and two centuries later, by a strong earthquake and after-shocks. Erosion of the foundations by water caused the tower to lean in the 18th century. Vernazzano was rebuilt in the valley, away from this site, which had been effective for territorial control but was less well-suited for living in. The Leaning Tower has therefore been abandoned for almost 300 years. To avoid its collapse, a steel reinforcement was recently added, with plates and wires as thick as . The Tower is not well known, being located away from the main streets. It is visible from far away, but not easily accessible.


In Literature

Lydia Sigourney Lydia Huntley Sigourney (September 1, 1791 – June 10, 1865), ''née'' Lydia Howard Huntley, was an American poet, author, and publisher during the early and mid 19th century. She was commonly known as the "Sweet Singer of Hartford." She had a ...
reflects on the lake, presently peaceable but with a history of violent warfare, in her poem , published in 1827.


Image gallery

File:Treesinthelake.jpg, Tree remains on Trasimeno's shores. They were planted when the lake's level was much lower and died when it rose. File:Lago Trasimeno veduta.jpg, The lake seen from Montebuono di Magione File:SAI Ambrosini factory plaque (Passignano sul Trasimeno).jpg, How SAI born in 1916 is explained there, in the front of the factory File:Tower of Vernazzano 2007.jpg, The Leaning Tower. Note the number of steel cables recently added to preserve it.


See also

*
Battle of Lake Trasimene The Battle of Lake Trasimene was fought when a Carthaginian force under Hannibal ambushed a Roman army commanded by Gaius Flaminius on 21 June 217 BC, during the Second Punic War. It took place on the north shore of Lake Trasimene, to th ...
(in the Second Punic War) *
Trasimene Line The Trasimene Line (so-named for Lake Trasimene, the site of a major battle of the Second Punic War in 217 BC) was a German defensive line during the Italian Campaign of World War II. It was sometimes known as the Albert Line. The German Comma ...
, battle in World War II *
Trasimène Trasimène was a department of the First French Empire from 1809-1814 in present-day Italy. It was named after Lake Trasimeno. It was formed on 15 July 1809, when the Papal States were annexed by France. Its capital was Spoleto. The department ...
,
département In the administrative divisions of France, the department (french: département, ) is one of the three levels of government under the national level (" territorial collectivities"), between the administrative regions and the communes. Ninety ...
of the
First French Empire The First French Empire, officially the French Republic, then the French Empire (; Latin: ) after 1809, also known as Napoleonic France, was the empire ruled by Napoleon Bonaparte, who established French hegemony over much of continental E ...
*
Umbria it, Umbro (man) it, Umbra (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = , demographics1_footnotes = , demographics1_title1 = , demographics1_info1 = , ...


References


External links


Official website







PDF file about climatic changes and Lake Trasimeno

The Role of Lake Trasimeno (central Italy) in the History of Hydrology and Water Management

Trasimeno recent hydrometric changes

Trasimeno recent hydrometric level changes-2
{{DEFAULTSORT:Trasimeno Endorheic lakes of Europe Lakes of Umbria