Doubs (river)
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.