Belleydoux (French pronunciation: [bəlɛdu][3]) is a commune in the Ain department in eastern France.

Belleydoux is situated at the southernmost end of the Hautes-Combes in the Jura mountains, and lies in the Semine valley, a tributary of the Rhône via the Valserine river.

The village is overlooked by the Roche Fauconnière cliff.

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