SaintignySaintigny is a commune in the Eure-et-Loir department in northern France. It was established on 1 January 2019 by merger of the former communes of Saint-Denis-d'Authou and Frétigny.GeographyThe Commune along with another 70 communes shares part of a 47,681 hectare, Natura 2000 conservation area, called the Forêts et étangs du Perche.