Yonne (river)

The Yonne is a river in the northern half of France. It flows mainly through the western part of the Bourgogne-Franche-Comté region, giving its name to the Yonne department and to several communes. It is the main left tributary of the Seine river.

The river was named during the Roman Empire as Icauna, a Latin word that likely came from the Celtic name for the river.

Geography
The Yonne river has a length of  and a drainage basin with an area of .

Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is 91.70 cubic metres per second at Courlon-sur-Yonne.

Average monthly discharge (m3/s) at Courlon-sur-Yonne (54 years)

Course
The source of the Yonne is on the Prénely mountain on the southern end of the Morvan hills in the Glux-en-Glenne commune, Nièvre department, at an altitude of about .

500px|thumb|center|Panoramic view of the source of the Yonne

The Yonne flows, in general, from the southeast to the northwest and passes through the 115 communes, most of them in the Bourgogne-Franche-Comté region; the main communes are:
 Nièvre (58): Corbigny, Clamecy
 Yonne (89): Auxerre, Joigny, Sens, Pont-sur-Yonne, Villeneuve-sur-Yonne
 Seine-et-Marne (77): Montereau-Fault-Yonne

Finally, it flows, as a left tributary, into the Seine river in the town of Montereau-Fault-Yonne, at  of altitude.

Main tributaries
The main tributaries of the Yonne are:
 Left tributary
 Beuvron - 40.5 km;
 Right tributaries
 Cure - 112.2 km;
 Serein - 188.2 km;
 Armançon - 202.1 km;
 Vanne - 58.7 km;

Gallery

Related pages
 List of rivers of France

 References 

Other websites

 Banque Hydro - Station H2721010 - L'Yonne à Courlon-sur-Yonne (Synthèse)  

Category:Rivers of Bourgogne-Franche-Comté
Category:Rivers of Île-de-France