Saint-Aignan, also unofficially Saint-Aignan-sur-Cher is a commune and town in the Loir-et-Cher department in the administrative region of Ce…Saint-Aignan, also unofficially Saint-Aignan-sur-Cher is a commune and town in the Loir-et-Cher department in the administrative region of Centre-Val de Loire, France. Saint-Aignan is located on the river Cher, and is around 35 km south of Blois.