The Sorgenti della Muzzetta Nature Reserve, classified under regional regulations as a “partial biological reserve,” extends across the municipalities of Rodano and Settala, in the eastern part of the Parco Agricolo Sud Milano. The reserve was established to protect a complex system of spring-fed water sources (fontanili) that give rise to the Muzzetta stream, including the Molino spring, the largest in the Province of Milan. Located within the territories of Rodano and Settala, the reserve safeguards a stretch of the typical Lombard spring-water landscape (risorgive). According to the latest regional boundary definition, the reserve covers a total area of 63.3 hectares, of which 25 hectares constitute the core protected area and 38.3 hectares form the buffer zone. The first recognition of the Sorgenti della Muzzetta as a site worthy of protection dates back to 1971, when the area was included in the Italian Biotope Map as part of the Territorial Research Program on natural areas to be protected, prepared by the National Research Council (CNR) in collaboration with the Ministry of Public Works. The reserve lies within the boundaries of the Parco Agricolo Sud Milano, a regional park managed by the Province of Milan, which is also responsible for the administration of the reserve. As the managing authority of the Park, the Province of Milan is likewise the institutional body responsible for the optimal management and conservation of the Site of Community Importance (SCI). The Sorgenti della Muzzetta, formed by the Molino, Vallazza, and Regelada springs together with the adjacent hygrophilous woodland, represent the core of the reserve. This area was acquired by the Province of Milan, which also owns a southern section where a pond for amphibians has been created. Overall, the protected area also includes four additional springs—Nuovo, Busca, Boscana, and Schenone—located on private land and in more peripheral positions relative to the main Sorgenti della Muzzetta. These features enrich the surrounding landscape by introducing further elements of environmental diversity. In addition to the springs, a significant naturalistic feature is the presence of a hygrophilous forest, which developed spontaneously near the heads of the Molino and Vallazza springs on land once occupied by a cultivated poplar grove. Black alder dominates this woodland, accompanied by willows, elms, and some English oaks. Other forested areas are present in the southern part of the reserve, partly enhanced by a recent intervention by the Park involving the planting of additional hygrophilous woodland and the creation of an amphibian pond. From a faunal perspective, the area is an important attraction for many species associated with aquatic and woodland environments. The Sorgenti della Muzzetta Nature Reserve lies in a predominantly agricultural area at 109 meters above sea level, straddling the municipalities of Rodano and Settala. The reserve includes three main springs, one of which—the Molino spring, the largest and probably the biggest in the Province of Milan—has a triangular shape and a striking appearance due to the presence of numerous bubbling upwellings emerging from the open water surface. Within it lies an island characterized by helophytic vegetation dominated by Carex elata, covering about 300 square meters, interspersed with a core of arboreal vegetation consisting of Salix alba. The Vallazza spring has a different character: it is smaller, completely surrounded by woodland, heavily shaded, and therefore lacks helophytic vegetation. Finally, the Regelada spring is the result of a recent restoration project carried out by the Parco Agricolo Sud Milano, which—based on old cadastral maps dating back to the 18th century—reconstructed the spring head that had been completely lost over time.