What is "yonne"

Yonne is a French department named after the river Yonne. It is one of the eight constituent departments of Bourgogne-Franche-Comté and is located in the northwest of the region, bordering Île-de-France. It was created in 1790 during the French Revolution. Its prefecture (capital) is Auxerre and its postcode number is 89.

It is the fourth most populous department in the region with a population of about 342,000 (2012), and an average annual increase over the last few years of 0.41% per year. The biggest city is Auxerre, the capital, with a population of 35,000 in the city and roughly 43,000 in the urban area centred on it.

The Yonne is a river in France, left tributary of the Seine. It is long. The river gives its name to the Yonne département. It rises in the Nièvre département, in the Morvan hills near Château-Chinon. It flows into the river Seine in Montereau-Fault-Yonne.

The Yonne flows through the following départements and towns:

• Nièvre: Château-Chinon, Clamecy
• Yonne: Auxerre, Migennes, Joigny, Villeneuve-sur-Yonne, Sens
• Seine-et-Marne: Montereau-Fault-Yonne

The main tributaries of the Yonne are the Vanne, the Armançon, the Serein and the Cure.