The Arnon () is a long river in central France. It is a left tributary of the river Cher which is a tributary of the Loire. Its source is near the village of Préveranges, west of Montluçon. Its longest tributary is the Théols. The Arnon flows generally north, through the following departments and towns:
Allier Cher: Culan, Lignières, Chârost Indre: Reuilly
The Arnon flows into the river Cher near Vierzon.
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