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Allaine
l'Allan (m, lower course)
Allaine; l'Allan (m, lower course)
	The Allaine in Porrentruy
Native name	l'Allaine (French)
Location
Countries	Switzerland, France
Physical characteristics
Source
• location	Above Charmoille near Porrentruy in the Swiss Jura mountains
• coordinates	47°25′46″N 7°13′49″E / 47.42939°N 7.23038°E
• elevation	598 m (1,962 ft)
Mouth
• location	Doubs near Montbéliard
• coordinates	47°28′43″N 6°45′35″E / 47.4785°N 6.7597°E
• elevation	335 m (1,099 ft)
Length	65 km (40 mi)
Basin size	322 km2 (124 sq mi)
Basin features
Progression	Doubs→ Saône→ Rhône→ Mediterranean Sea

The Allaine (French: l'Allaine [lalɛn] (f), in its lower course l'Allan [lalɑ̃] (m), (German: Hall) 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. It is a right tributary of the Doubs, which it joins a few km downstream from Montbéliard, where it takes the Savoureuse with it, a river with its sources in the southern Vosges.^[1]