Largest tributaries
The Doubs (/duː/ doo; French: [du]; German: Dub) is a 453-kilometre river in far eastern France which strays into western Switzerland. It is a left-bank tributary of the Saône. It rises near Mouthe in the western Jura mountains, at 946 metres and its mouth is at Verdun-sur-le-Doubs, a village and commune in Saône-et-Loire at about 175 m above sea level. It is the tenth-longest river in France.
The most populous settlement of the basin lies on its banks, Besançon. Its course includes a small waterfall and a 4-kilometre narrow lake.
