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The Sioule is a 167 kilometres (104 mi) long river in central France, left tributary of the river Allier. Its source is near the village Orcival, north of Mont-Dore, in the Massif Central. The Sioule has cut a deep gorge, especially in its upper course. The Sioule flows generally northeast through the following départements and towns:

The Sioule (in the Central of France ) flows into the river Allier at La Ferté-Hauterive, 10 km (6 mi) north of Saint-Pourçain-sur-Sioule.

Its main tributaries are the Sioulet and the Bouble.

The Fades viaduct, the tallest bridge in France, is located on the Sioule.