The "Medio Olona Park" is a Local Park of Supra-municipal Interest (PLIS) established in 2006 between six municipalities in the area in the province of Varese. Its main purpose is to protect the natural, landscape and historical-cultural resources of the Olona River Valley. The park extends over approximately 617 hectares, mainly in the territories of Fagnano Olona and Gorla Maggiore. Characterized by the presence of the Olona river, the park has a naturalistic value and represents historical Lombard land. Since 2020, it has been managed by the Pineta di Appiano Gentile e Tradate regional park. The park logo features an owl, the Olona river and a leaf which symbolize active participation in the life of the park. The purposes include the protection of biodiversity, the conservation of natural heritage and the integration between social enjoyment and environmental protection.