What is "rieux"

Rieux is the name or part of the name of several communes in France:

• Rieux, Marne, in the Marne department
• Rieux, Morbihan, in the Morbihan department
• Rieux, Oise, in the Oise department
• Rieux, Seine-Maritime, in the Seine-Maritime department
• Rieux-de-Pelleport, in the Ariège department
• Rieux-en-Cambrésis, in the Nord department
• Rieux-en-Val, in the Aude department
• Rieux-Minervois, in the Aude department
• Rieux-Volvestre, formerly Rieux, in the Haute-Garonne department