The Doubs ( ; ; ; ) is a 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 and its mouth is at Verdun-sur-le-Doubs, a village and commune in Saône-et-Loire at about 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 narrow lake.
Course
From its source in Mouthe it flows northeast: a few kilometers north of the French-Swiss border, then to form the border for less distance, about 40 km. North of the Swiss town of Saint-Ursanne it turns west then southwest. South-east of Montbéliard it adopts a southwest striation or fault of the Jura Mountains, flowing so over greater distance than the flow it has traced before. It then flows into the Saône at Verdun-sur-le-Doubs about northeast of Chalon-sur-Saône.
The shape of the course resembles the silhouette of a terrier sitting upright, leaning right, with the upper part of a northeastern corner "ear" the only zone in Switzerland, there reaching Saint-Ursanne. In that country it borders or crosses the cantons Jura and Neuchâtel.
Waterfalls and lake
The falls known as the Saut du Doubs is on the French-Swiss border.
Nearby, the river, dammed up by landslide debris, forms the long, wide, winding lake, (le) Lac des Brenets. The -high Doubs Falls are at the lake's end. The falls can be reached on foot or by passenger boat.
thumb|left|250px|The Saut du Doubs
thumb|left|250px|Course of the Doubs
The Doubs flows through the following Departments of France, Cantons of Switzerland, and cities:
- Doubs (F): Pontarlier
- Neuchâtel (CH)
- Jura (CH): Saint-Ursanne
- Doubs (F): Montbéliard, Besançon
- Jura (F): Dole
- Saône-et-Loire (F): Verdun-sur-le-Doubs
Tributaries include: