The Elsa () is a

river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...

in the Italian region of

Tuscany Tuscany ( ; ) is a Regions of Italy, region in central Italy with an area of about and a population of 3,660,834 inhabitants as of 2025. The capital city is Florence. Tuscany is known for its landscapes, history, artistic legacy, and its in ...

. It flows northward to empty into the left bank of the

Arno The Arno is a river in the Tuscany region of Italy. It is the most important river of central Italy after the Tiber. Source and route The river originates on Monte Falterona in the Casentino area of the Apennines, and initially takes a sou ...

. From its source at Molli, Sovicelle, the flow of the river is low until its reaches its major tributaries at ''Vene di Onci'' and ''Caldane''. The mouth of the river divides

Frazione A ''frazione'' (: ''frazioni'') is a type of subdivision of a ''comune'' ('municipality') in Italy, often a small village or hamlet outside the main town. Most ''frazioni'' were created during the Fascist era (1922–1943) as a way to consolidat ...

Marcignana of

Empoli Empoli () is a town and ''comune'' in the Metropolitan City of Florence, Tuscany, Italy, about southwest of Florence, to the south of the Arno River, Arno in a plain formed by the river. The plain has been usable for agriculture since Ancient Ro ...

and Isola, San Miniato. The basin of the Elsa has been continuously inhabited since at least the time of the

Etruscan civilization 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 ...

. The Elsa River Basin is located between Montagnola Senese and the rolling hills of

Chianti Chianti is an Italian red wine produced in the Chianti (region), Chianti region of central Tuscan wine, Tuscany, principally from the Sangiovese grape. It was historically associated with a squat bottle enclosed in a straw basket, called a ''fia ...

, roughly corresponding to the eponymous

valley A valley is an elongated low area often running between hills or mountains and typically containing a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over ...

Val d'Elsa. Catchments are predominantly fan shaped. It encompasses a number of ''

comune 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 ...

'' (municipalities) in the

provinces A province is an administrative division within a country or state. The term derives from the ancient Roman , which was the major territorial and administrative unit of the Roman Empire's territorial possessions outside Italy. The term ''provi ...

Florence Florence ( ; ) is the capital city of the Italy, Italian region of Tuscany. It is also the most populated city in Tuscany, with 362,353 inhabitants, and 989,460 in Metropolitan City of Florence, its metropolitan province as of 2025. Florence ...

and

Siena Siena ( , ; traditionally spelled Sienna in English; ) is a city in Tuscany, in central Italy, and the capital of the province of Siena. It is the twelfth most populated city in the region by number of inhabitants, with a population of 52,991 ...

References

Rivers of the Province of Siena Rivers of the Metropolitan City of Florence {{Italy-river-stub