Armançon

The Armançon is a river in France. It is a right tributary of the Yonne river. It flows mostly through the Bourgogne-Franche-Comté region.
Eight "communes" have the name of the river in their names: Aisy-sur-Armançon, Argenteuil-sur-Armançon, Brienon-sur-Armançon, Chailly-sur-Armançon, Montigny-sur-Armançon, Pacy-sur-Armançon, Perrigny-sur-Armançon, Saint-Martin-sur-Armançon.
Geography.
The Armançon 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 28.90 cubic metres per second at Brienon-sur-Armançon in the Yonne department.
Course.
The source of the Armançon is in the natural region of "Auxois", about to the northwest of the town Meilly-sur-Rouvres, Côte-d'Or department, at an altitude of about .
The Armançon flows, in general, to the northwest and passes through the following regions, departments and "communes":
Finally, it flows, as a right tributary into the Yonne river at the limits of the "communes " Migennes and Cheny, in the Yonne department, at of altitude.
Main tributaries.
The main tributaries, with a length greater than 30 km, of the Armançon are (only right tributaries because the left tributaries are very short):