DOUBS, a river of eastern France, rising in the Jura at the foot of the Noirmont ridge, at a height of 3,074 ft., and flowing into the Saone. It is 269 m. long, though, owing to the fact that it doubles back upon itself, the distance from source to mouth in a direct line is only 56 miles. Its basin has an area of 3,020 sq. miles. The river begins by flowing north-east and traverses the Lake of St. Point and passes Pontarlier. Thenceforth its course lies chiefly through wooded limestone gorges of great grandeur. After skirting the town of Morteau, below which it expands into the Lake of Chaillexon and descends over the Fall of the Doubs (88 ft.), the river for about 28 m. forms the frontier between France and Switzerland. It flows in the latter country for some distance and then turns abruptly westward. Thus far the Doubs has been flowing between the folds of the Jura, but when it comes against the shattered southern face of the old block of the Vosges its course is rapidly altered. After turning westward it finds its way through this complicated country by turning north, and finally, at Voujeaucourt, south-west. Below that town the river is joined by the canal from the Rhone to the Rhine, to accommodate which its course has been canalized as far as Dole. The Doubs passes Clerval and Baume-les-Dames to Besancon. The lower section of its course is in the great structural depression between the Cote d'or and the Jura. After passing Dole it leaves the high ground and enters the plain of the Saone: Here it receives the waters of the Loue, which also has a complicated structural history, finding its way, like the Doubs, between the outer folds of the Jura--sometimes parallel with them and sometimes cutting across them, and finally falling into the great structural depression with the lower Doubs and Saone. The Doubs reaches the Saone at Verdun-sur-le-Doubs. The river is navigable only for approximately 8 miles above its mouth.