The Trieux (French pronunciation: [tʁijø]; Breton: Trev) is a 72-kilometre-long (45 mi) river[1] in the Côtes-d'Armor department, Brittany, France, beginning near Kerpert.

It empties into the English Channel near Lézardrieux.

Other towns along the Trieux are Guingamp and Pontrieux.

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