Сена

The Yonne is a river in France, a left-bank tributary of the Seine. It is 292 kilometres (181 mi) 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 at Montereau-Fault-Yonne.The Yonne flows through the following départements and towns: Nièvre: Château-Chinon, ClamecyYonne: Auxerre, Migennes, Joigny, Villeneuve-sur-Yonne, SensSeine-et-Marne: Montereau-Fault-YonneThe main tributaries of the Yonne are the Vanne, the Armançon, the Serein and the Cure.

The Communauté de communes du Pays de Montereau (before 2017: Communauté de communes des Deux Fleuves) is a federation of municipalities (communauté de communes) in the Seine-et-Marne département and in the Île-de-France région of France. On 1 January 2017 it was expanded with 7 communes from the former Communauté de communes du Bocage Gâtinais, and its name was changed from Communauté de communes des Deux Fleuves to Communauté de communes du Pays de Montereau.