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 and its basin area is . 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 References External links Website of an association of owners of historical sites in the Ognon valley (french - english) Rivers of France Rivers of Côte-d'Or Rivers of Doubs Rivers of Haute-Saône Rivers of Jura (department) Rivers of Bourgogne-Franche-Comté