Allaine

Infobox River | river_name = Allaine


caption =
origin = Jura mountains
mouth = Doubs River
coord|47|28|42|N|6|45|41|E|name=Doubs-Loue|display=inline,title
basin_countries = Switzerland, France
length = 65 km
elevation = 605 m
discharge =
watershed = 322 km²The Allaine (named "Allan" in its lower course) is a 65 km long river in northwestern Switzerland and eastern France. Its source is in the village Charmoille, in the Swiss Jura mountains. It is a left tributary of the Doubs, which it joins a few km downstream from Montbéliard.

The Allaine flows through the following cantons, départements and towns:

*Canton of Jura (CH): Charmoille, Porrentruy
*Territoire de Belfort (F): Delle
*Doubs (F): Montbéliard