Doubs (river)

The Doubs is a river in eastern France and western Switzerland. It is a left tributary of the Saône river that flows through the Bourgogne-Franche-Comté region and the French-speaking Switzerland.
The Doubs department is named after this river.
Geography.
The Doubs 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 at Neublans-Abergement, a "commune" in the Jura department near the confluence of the Doubs and the Saône.
Average monthly discharge (m3/s) at Neublans-Abergement (52 years)
Course.
The Doubs river starts in the "commune" of Mouthel in the Doubs department, at an altitude of about in the Jura Mountains near the French-Swiss border. Then it flows to the northeast and pass through the "Lac de Saint-Point" lake and forms the border between France and Switzerland for several kilometres before going into Switzerland, into the canton of Jura, in the region known as "Clos du Doubs". The waterfall named as "Saut du Doubs" on the French-Swiss border. Then the river turns to the west and gets back into France. Finally, the river flows to southwest to join the Saône river.
The Doubs river flows through one region and three departments in France, and two cantons (Neuchâtel and Jura) in Switzerland. It flows through the following "communes", among others:
The river forms several lakes:
The Doubs river flows into the Saône river as a leftt tributary in the city of Verdun-sur-le-Doubs.
Main tributaries.
The main tributaries, over 30 km long, of the Doubs river are:
Left tributaries:
Right tributaries:
Hydroelectricity.
The Doubs is used for electricity generation (hydroelectricity). Among several hydroelectric stations, the most important are the "Dam of Châtelot", tall, and the "Dam of Refrain", tall.