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The '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