The Campo dei Fiori Regional Nature Reserve includes not only the massif behind Varese but also the Martica-Chiusarella massif. The Campo dei Fiori massif has also an underground world consisting of numerous caves, some of which very deep and not completely explored.

The Ticino Valley Lombardy Nature Reserve is the management agency that protects the lombard side of the Ticino River. The protected area of the Ticino River is the largest river reserve in Europe.

Appiano Gentile and Tradate Pinewood Regional Nature Reserve is a large green belt between the provinces of Como and Varese.

This Regional NatureReserve, designated an EU Special Protection Area for Birds in 1987, consists of over 450 hectares in which 170 species of birds, 27 species of mammals, 8 species of reptiles and 7 species of amphibians proliferate.
The rarest one is the Lataste's frog.

Located among the towns of Busto Arsizio, Castellanza and Legnano, is a flat area consisting of meadows, arable land and small woods.

This park consists of the gardens and land of old villas in the municipality of Malnate.

They're part of the wetlands, portions of land periodically flooded or close to water sources. They're all important in ecological terms because of the rarity of the plants or animals that live there.

Many of the lush parks of the 18th century magnificent villas became public gardens, open all the year.