The Ofanto, known in ancient times as Aufidus, from the Greek

Greek language

Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 Ophidus, Ωφιδους, meaning snake, is a 170 km river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in southern Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

. which flows through the regions of Campania

Campania

Campania is a region in southern Italy. The region has a population of around 5.8 million people, making it the second-most-populous region of Italy; its total area of 13,590 km² makes it the most densely populated region in the country...

, Basilicata

Basilicata

Basilicata , also known as Lucania, is a region in the south of Italy, bordering on Campania to the west, Apulia to the north and east, and Calabria to the south, having one short southwestern coastline on the Tyrrhenian Sea between Campania in the northwest and Calabria in the southwest, and a...

 and Puglia, and into the Adriatic Sea

Adriatic Sea

The Adriatic Sea is a body of water separating the Italian Peninsula from the Balkan peninsula, and the system of the Apennine Mountains from that of the Dinaric Alps and adjacent ranges...

 near Barletta

Barletta

Barletta is a city and comune located in the north of Apulia in south eastern Italy. Its current population is 94,140.It is famous for the Colossus of Barletta, a bronze statue, representing a Roman Emperor...

.
near Canosa di Puglia there is an ancient Roman bridge known all over the south of Italy.

length of the river

Its source is Irpinia

Irpinia

Irpinia is a region of the Apennine Mountains around Avellino, a town in Campania, South Italy about 40 km east of Naples...

 Plateau to 715 m above sea level, below the plane of the Angel, near Avellino

Avellino

Avellino is a town and comune, capital of the province of Avellino in the Campania region of southern Italy. It is situated in a plain surrounded by mountains 42 km north-east of Naples and is an important hub on the road from Salerno to Benevento.-History:Before the Roman conquest, the...

. Throughout parts of Campania

Campania

Campania is a region in southern Italy. The region has a population of around 5.8 million people, making it the second-most-populous region of Italy; its total area of 13,590 km² makes it the most densely populated region in the country...

 and Basilicata

Basilicata

Basilicata , also known as Lucania, is a region in the south of Italy, bordering on Campania to the west, Apulia to the north and east, and Calabria to the south, having one short southwestern coastline on the Tyrrhenian Sea between Campania in the northwest and Calabria in the southwest, and a...

, then rolling mainly in Puglia. Flows into the Adriatic Sea

Adriatic Sea

The Adriatic Sea is a body of water separating the Italian Peninsula from the Balkan peninsula, and the system of the Apennine Mountains from that of the Dinaric Alps and adjacent ranges...

, near Barletta

Barletta

Barletta is a city and comune located in the north of Apulia in south eastern Italy. Its current population is 94,140.It is famous for the Colossus of Barletta, a bronze statue, representing a Roman Emperor...

. At the end of its course, the Ofanto ends with a mouth on the delta, although rapid retreat to an estuary. The Ofanto has a torrential regime markedly with major floods in autumn and winter rainfall in summer and low flows remarkable. In spite then of considerable length and extent of its basin average flow at the mouth is quite low (less than 15 cubic meters per second)