Ognon (Franche-Comté)

The Ognon is a river of Eastern France. It is a left tributary of the Saône, which it joins in Pontailler-sur-Saône. Its source is in Haut-du-Them-Château-Lambert in the Vosges Mountains near the Ballon d'Alsace. Its length is 214 km and its basin area is 2308 km2.

The Ognon flows through the following departments and towns: Haute-Saône, with Mélisey, Lure, Villersexel, Pesmes; Doubs, with Rougemont; Jura; Côte-d'Or, with Pontailler-sur-Saône.

Tributaries
Some of its tributaries include:
 * The Rahin
 * The Scey
 * The Reigne
 * The Buthiers