The Park covers the most important and semi-natural area of the upper plain of Lombardy, more precisely in the north-west of Milan, up to the boundary with the city of Como, thanks to the recent extension and annexation of the territories of the former PLIS (Local Park extending over many municipalities) della Brughiera Briantea. It is a moorland very interesting from a geological point of view, since it is characterized by "ironed" clayey terraces favoring the presence of many floristic species. The vegetation is rich in moorland (among the southernmost formations in Europe) which give gradually way to Scotch pine and birch woodlands and then to oak and hornbeam woodlands. The Park is rich in considerable interesting historical and artistic features including the Castellazzo in Bollate, the Valera in Arese, Villa Borromeo in Senago, and Cascina Mirabella in Lentate sul Seveso, as well as evidences of industrial archaeology. As well as those of ecological-naturalistic interest, among all the Sites of Community Importance (SCI) recognised by the European Union within the "Habitats Directive" framework, aimed at preserving biodiversity through the conservation of natural habitats and wild flora and fauna in the European territory.