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Yonne (river) facts for kids

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The Yonne river at Auxerre
Country France
Regions Bourgogne-Franche-Comté, Île-de-France
Departments Nièvre, Yonne, Seine-et-Marne
Communes Corbigny, Clamecy, Auxerre, Migennes, Joigny, Villeneuve-sur-Yonne, Sens, Montereau-Fault-Yonne
 - left Beuvron
 - right Cure, Serein, Armançon, Vanne
Cities Auxerre, Sens
Source Morvan
 - location Glux-en-Glenne, Nièvre, France
 - elevation 738 m (2,421 ft)
 - coordinates 46°57′22″N 4°0′39″E / 46.95611°N 4.01083°E / 46.95611; 4.01083
Mouth Seine
 - location Montereau-Fault-Yonne, Seine-et-Marne, France
 - elevation 47 m (154 ft)
 - coordinates 48°23′19″N 2°57′26″E / 48.38861°N 2.95722°E / 48.38861; 2.95722
Length 292.3 km (182 mi)
Basin 10,836 km² (4,184 sq mi)
Discharge for Courlon-sur-Yonne
 - average 91.7 /s (3,238 cu ft/s)

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.


The Yonne river has a length of 292.3 km (181.6 mi) and a drainage basin with an area of 10,836 km2 (4,184 sq mi).

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)


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 738 m (2,421 ft).

Source de l'Yonne (Panoramique)
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:

Finally, it flows, as a left tributary, into the Seine river in the town of Montereau-Fault-Yonne, at 47 m (154 ft) 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;


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