Rio Vallone Park is a Local Park (Parco Locale di Interesse Sovracomunale - PLIS) involving the Municipalities of Basiano, Bellusco, Cavenago di Brianza, Gessate, Masate, Ornago and, only recently, Aicurzio, Busnago, Cambiago, Mezzago, Sulbiate, and Verderio Inferiore. The Park territory is characterized by river-glacial terraces dug by the course of the stream Vallone. There are several wetlands born in old clay quarries favoring a positive exchange between different ecosystems.