Forte di Mont Bart

The Allaine (French: l'Allaine (f), in its lower course l'Allan (m)) is a 65 km long river in northwestern Switzerland and eastern France. Its source is above the village Charmoille, in the Swiss Jura mountains. Downstream from its confluence with the Bourbeuse and the Canal du Rhône au Rhin, near Méziré, it is called the Allan.